1) The compound tetraethylammonium octachlorodirhenate(II) ([(C2H5)4N]2[Re2Cl8]) was synthesized by reducing tetraethylammonium perrhenate with hydrogen gas under pressure in hydrochloric acid at 130°C.
2) An X-ray crystallographic analysis revealed strong crystallographic disorder of the cations and anions, which correlate with one another. The tetraethylammonium cations and [Re2Cl8]2- anions are disordered across multiple crystallographic sites.
3) Interatomic distances in the structure are similar to closely related compounds. Short
Совместная статья с проф. Коттоном про статистическое разупорядочение фрагментов в кластерных соединениях (первое соединение с разупорядочением и по катиону и по аниону)
Synthesis and characterization of the mixed ligand complexesTaghreed Al-Noor
This paper presents the synthesis and study of some new mixed-ligands complexes
containing anthranilic acid and amino acid L-alanine (Ala) with some metals. The resulting
products were found to be solid crystalline complexes which have been characterized by using
(FT-IR,UV-Vis) spectra , melting point, molar conductivity , chloride ion content were also
determin by (mohr method) and determination the percentage of the metal in the complexes by
(AAS).The proposed structure of the complexes was suggested using program , Chem Office
3D(2004) .The general formula have been given for the prepared complexes :
[M(A)(Ala)]. nH2O n= 0,2
AH = Anthranilic acid = C7H7NO2 AlaH = alanine = C3H7NO2
Anthranilate ion = C7H6NO2- Ala- = Alanin ate ion = C3H6NO2-
M(II): Mn(II) ,Fe(II),Co(II) , Ni(II) , Cu(II) , Zn(II) and Cd
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Mannich Synthesis Under Ionic Liquid [Et3NH][HSO4] CatalysisIOSRJAC
Ionic liquid [Et3NH][HSO4] was found to be a particularly efficient catalyst for the synthesis of β- amino carbonyl pyrimidines through the Mannich condensation reaction of substituted pyrimidin-2(1H)-ones, cyclohexanone and 4-fluro/chlorobenzaldehyde under ultrasonic irradiation at room temperature. The present methodology offers several advantages such as excellent yields, simple procedure and mild conditions.
Совместная статья с проф. Коттоном про статистическое разупорядочение фрагментов в кластерных соединениях (первое соединение с разупорядочением и по катиону и по аниону)
Synthesis and characterization of the mixed ligand complexesTaghreed Al-Noor
This paper presents the synthesis and study of some new mixed-ligands complexes
containing anthranilic acid and amino acid L-alanine (Ala) with some metals. The resulting
products were found to be solid crystalline complexes which have been characterized by using
(FT-IR,UV-Vis) spectra , melting point, molar conductivity , chloride ion content were also
determin by (mohr method) and determination the percentage of the metal in the complexes by
(AAS).The proposed structure of the complexes was suggested using program , Chem Office
3D(2004) .The general formula have been given for the prepared complexes :
[M(A)(Ala)]. nH2O n= 0,2
AH = Anthranilic acid = C7H7NO2 AlaH = alanine = C3H7NO2
Anthranilate ion = C7H6NO2- Ala- = Alanin ate ion = C3H6NO2-
M(II): Mn(II) ,Fe(II),Co(II) , Ni(II) , Cu(II) , Zn(II) and Cd
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Mannich Synthesis Under Ionic Liquid [Et3NH][HSO4] CatalysisIOSRJAC
Ionic liquid [Et3NH][HSO4] was found to be a particularly efficient catalyst for the synthesis of β- amino carbonyl pyrimidines through the Mannich condensation reaction of substituted pyrimidin-2(1H)-ones, cyclohexanone and 4-fluro/chlorobenzaldehyde under ultrasonic irradiation at room temperature. The present methodology offers several advantages such as excellent yields, simple procedure and mild conditions.
synthesis and characterization of hydrazone ligand and their metal complexesMUBASHIRA M
This slide mainly contain the synthesis, characterization of a few hydrazine based heterocyclic ligand such as hydralazone and phenyl hydralazone and also their metal complexes. so in this work, my aim is to synthesise the ligands; 2-thiophenecarboxylaldehydehydralazone and 2,3-butanedionephenylhydrazone. also to characterized the synthesised hydrazones by different physiochemical techniques.
Shift of Reaction Pathway by Added Chloride Ions in the Oxidation of Aromatic...Ratnakaram Venkata Nadh
Role of added chloride ions on the shift of reaction pathway of oxidation of aromatic ketones (acetophenone,
desoxybenzoin) by dichloroisocyanuric acid (DCICA) was studied in aqueous acetic acid—perchloric
acid medium. Participation of enolic and protonated forms of ketones in the rate determining steps is
manifested from zero and first orders with respect to the oxidant in absence and presence of added chloride
ions, respectively. Positive and negative effects of acid and dielectric constant on the reaction rate were
observed. The observations deduce plausible mechanisms involving (i) rate-determining formation of enol
from the conjugate acid of the ketone (SH+) in the absence of added chloride ions and (ii) rapid formation of
molecular chlorine species from HOCl (hydrolytic species of DCICA) in the presence of added chloride ions,
which then interacts with SH+ in a rate-determining step prior to the rapid steps of product formation. The
order of Arrhenius parameters substantiate the proposed plausible mechanisms based on order of reactants
both in presence and absence of added chloride ions.
synthesis and characterization of hydrazone ligand and their metal complexesMUBASHIRA M
This slide mainly contain the synthesis, characterization of a few hydrazine based heterocyclic ligand such as hydralazone and phenyl hydralazone and also their metal complexes. so in this work, my aim is to synthesise the ligands; 2-thiophenecarboxylaldehydehydralazone and 2,3-butanedionephenylhydrazone. also to characterized the synthesised hydrazones by different physiochemical techniques.
Shift of Reaction Pathway by Added Chloride Ions in the Oxidation of Aromatic...Ratnakaram Venkata Nadh
Role of added chloride ions on the shift of reaction pathway of oxidation of aromatic ketones (acetophenone,
desoxybenzoin) by dichloroisocyanuric acid (DCICA) was studied in aqueous acetic acid—perchloric
acid medium. Participation of enolic and protonated forms of ketones in the rate determining steps is
manifested from zero and first orders with respect to the oxidant in absence and presence of added chloride
ions, respectively. Positive and negative effects of acid and dielectric constant on the reaction rate were
observed. The observations deduce plausible mechanisms involving (i) rate-determining formation of enol
from the conjugate acid of the ketone (SH+) in the absence of added chloride ions and (ii) rapid formation of
molecular chlorine species from HOCl (hydrolytic species of DCICA) in the presence of added chloride ions,
which then interacts with SH+ in a rate-determining step prior to the rapid steps of product formation. The
order of Arrhenius parameters substantiate the proposed plausible mechanisms based on order of reactants
both in presence and absence of added chloride ions.
The effects of oxygen isotope substitution 16O ↔ 17O ↔ 18O in the coordination sphere of the
pertechnetate anion ( ) on the NMR 99Tc chemical shifts and 99Tc–17O and 17O–99Tc spin coupling
constants have been studied by 17O and 99Tc NMR. The isotope shifts 16/17Δ and 16/18Δ in 99Tc NMR and the
spin coupling constants of the Tc 16O3
18O–, Tc 16O3
17O–, Tc 16O2
17O 18O–, and
isotopomers have been measured. For the Tc 16O3
18O– and Tc 16O3
17O– anions in an ammonium pertechne
tate solution, the temperature dependences of the isotope shift in the temperature range 278–333 K are
described by linear relationships 16/18Δ = –0.616 + 6.45 × 10–4T (ppm) and 16/17 Δ = –0.302 +2.67 × 10–4T
(ppm), respectively. For the Tc16O3
17O– anion in a sodium pertechnetate solution, the magnitude of the
1Δ(16/17O) isotope shift nonlinearly decreases with increasing temperature. The nonlinear temperature
dependence of the J(99Tc–17O) spin coupling constant and the extreme point on the curve of the 1Δ(16/18O)
isotope shift versus temperature for the isotopomers in an NaTcO4 solution are presumably related to equilib
rium between contact and waterseparated ion pairs.
Synthesis and characterization of some Chromium(III) complexes of dibasic tri...IJERA Editor
Coordination complexes of Cr(III)with four tridentate Schiff base ligands viz. N-(2-hydroxy-1-naphthaldehyde)- -(4-nitrobenzoyl)hydrazone(HNNH = H2L 1 ), N-(2-hydroxy-4-methoxybenzaldehyde)- -(2-furoyl) hydrazone (HMFH = H2L 2 ), N-(2-hydroxyacetophenone)- -(2-theonyl) hydrazone (HATH = H2L 3 ) and N-(2- hydroxy-5-methylacetophenone)- -(3-toloyl) hydrazone (HMAT = H2L 4 ) have been synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance, thermogravimetric analysis and spectral (IR, electronic, NMR) measurements. IR spectra indicates that the ligand behave as dibasic tridentate ligand in a chelate coordinating to Cr(III) ion through ketonic oxygen, azomethine nitrogen and by both enolic and phenolic protons (except in H2L 1 by naphtholic oxygen atom) via double deprotonation of ligands. The magnetic and spectral data indicate chelate in octahedral environment and analytical data suggest 1:1 stoichiometries for the complexes
A ruthenium-carbamato-complex derived from a siloxylated amine and carbon dio...Pawan Kumar
The rutheniumcarbamate complex derived from3-trimethoxysilyl-1-
propyl amine and carbon dioxidewas found to be a novel catalyst for
the oxidative cyanation of aromatic and cyclic tertiary amines to
corresponding a-amino nitriles in high to excellent yields by using
hydrogen peroxide and molecular oxygen as enviro-economic
oxidants. The developed protocol suggested an efficient alternative
for recycling carbon dioxide.
Theoretical investigation of the Structure Activity Relationships (SARs) of a...IJERA Editor
Theoretical study of a series of isomeric α-, β-, γ-, δ-, ε-RuCl2L2 (L= azpy, tazpy, 4mazpy, 5mazpy) complexes is carried out using the density functional theory (DFT) method at B3LYP/LanL2DZ level. The effects of the ligand on the electronic structures and related properties, e.g. the components and the energies of some frontier molecular orbital, the net charge populations of some main atoms of the complexes, the effect of substituent methyl as well as the Structure Activity-Relationships (SARs) of the complexes were investigated. The results show that the sterical differences between isomeric structures of these complexes have serious influence on their electronic structures and related properties. First and foremost, the geometric configuration of δ-Cl and γ-Cl isomers must be advantageous to the conjugative ligand to intercalate between DNA-base-pairs in comparison with α-Cl, β-Cl and ε-Cl complexes. Secondly, the energy order of the lowest unoccupied molecular orbital (LUMO) of the isomers is ELUMO(δ-Cl) < ELUMO(γ-Cl) < ELUMO(ε-Cl) < ELUMO(α-Cl) < ELUMO(β-Cl). And their HOMO-LUMO gap energy is classified as ΔE(δ-Cl) < ΔE(γ-Cl) < ΔE(ε-Cl)< ΔE(α-Cl)< ΔE(β-Cl). Thirdly, the dipole moments (µ) of the isomers, expressing the hydrophobic parameters of the molecules, was also classified as μ(ε-Cl) > μ(β-Cl) > μ(α-Cl) > μ(γ-Cl) > μ(δ-Cl). Finally, the net charge of the ligands azopyridine that defines the aptitude for the ligand to accept the electron from DNA, are classified as QL(δ-Cl) > QL(γ-Cl) > QL(ε-Cl) > QL(α-Cl) >QL(β-Cl). These electronic and geometric structural characteristics can be used to explain the trend in the anticancer-activities (A) of isomeric α-, β-, γ- RuCl2L2 (L= azpy, tazpy, 4mazpy) or to predict the order of activity of the five δ-Cl, γ-Cl, α-Cl, β-Cl and ε-Cl isomers of the three complexes RuCl2(azpy)2, RuCl2(tazpy)2 and RuCl2(4mazpy)2. They are also suitable to predict the activity of five non synthesized isomers of RuCl2(5mazpy)2 since the three azopyridine ligands tazpy, 4mazpy and 5mazpy display the same number of electrons.
Spectral studies of 5-({4-amino-2-[(Z)-(2-hydroxybenzylidene) amino] pyrimidi...IOSR Journals
Some transition metal ions Complexes with 5-({4-amino-2-[(Z)-(2-hydroxybenzylidene) amino]
pyrimidin-5-yl} methyl)-2,3,4-trimethoxybenzene were prepared and characterized by elemental analyses,
Infrared , magnetic moment, electronic spectra , mass spectra, X-ray powder diffraction, molar conductance
and thermal analysis (TGA). The complexes have general formulae [ML2.2H2O] {where M = Mn (II), Co (II), Ni
(II), Cu (II), Zn (II), Pd (II) and Pt (II). The coordination behavior of the metal ions towards to the investigated
Schiff base takes place through –C=N,-NH2 and –OH groups. The obtained C, H and N elemental analysis data
showed the Metal: Ligand ratio is 1:2 [M: L] ratio. The molar conductance data reveal that all the metal
complexes are non-electrolytic in nature. From the magnetic moments the complexes are paramagnetic except
Zn metal ion complexes have octahedral geometry with coordination number eight. The thermal behavior of
these complexes shows that, the hydrated complexes have loses two water molecules and immediately followed
by decomposition of the anions and ligand molecules in the second and third stage. The Schiff bases and metal
complexes show good activity against some bacteria. The antimicrobial results indicate that, the metal
complexes have better antimicrobial activity as compared to the prepared Schiff base.
The cholesteric liquid-crystal poly[oxycarbonyl-1,4-phenylene-oxy-1,4 terephthaloyl-oxy-1,4-phenylenecarbonyloxy(
1,2-dodecane)] [C34H36O8]n, named PTOBDME, synthesized by polycondensation reaction from
equimolar quantities of TOBC and the racemic mixture of glycol (R-S-1,2 dodecanediol), exhibits unexpected
optical activity and chiral morphology. The structure of racemic-PTOBDME, under different polymerization
kinetics conditions, is analyzed by conventional NMR techniques and compared with those of polymer
enantiomers R-PTOBDME and S-PTOBDME obtained starting R(+)1,2 and S(-)1,2-dodecanediol respectively.
Molecular models based on the NMR signals intensities are proposed. The optical activity of racemic-
PTOBDME is evaluated by measuring the ORD values during kinetics study, and compared to the chiral
polymers. Each enantiomeric polymer seems to present the same stereoregular head-tail, isotactic structure than
the racemic, which we explain by the higher reactivity of the primary hydroxyl than the secondary one in the
glycol through polycondensation. For each enantiomer, two independent sets of signals were observed by NMR,
explained as two diastereomeric helical conformers: gg and gt, related with two possible staggered
conformations, along the copolymer backbone. Chirality in racemic-PTOBDME is proposed to be due to the
kinetic resolution of a preferable helical diastereomer, such as Sgt, with respect to the possible four forms, while
the R/S ratio of asymmetric carbon atoms remained 50:50. Chiral amplification is observed in R-PTOBDME and
S-PTOBDME due to a helical screw sense excess. Optimum yield was obtained for racemic PTOBDME, after
120 minutes polycondensated and decanted in toluene for 24 hours. Two weeks later a second fraction
precipitated from the toluene mother liquor with 67.6% chiral excess. After eight months and two weeks a third
fraction precipitated with 85.2% chiral excess.
Structural and Dielectric Properties of Lanthanum Substituted Lead ZirconateT...iosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Asymmetric Multipole Plasmon-Mediated Catalysis Shifts the Product Selectivit...Pawan Kumar
Cu/TiO2 is a well-known photocatalyst for the photocatalytic transformation of CO2 into methane. The formation of C2+ products such as ethane and ethanol rather than methane is more interesting due to their higher energy density and economic value, but the formation of C–C bonds is currently a major challenge in CO2 photoreduction. In this context, we report the dominant formation of a C2 product, namely, ethane, from the gas-phase photoreduction of CO2 using TiO2 nanotube arrays (TNTAs) decorated with large-sized (80–200 nm) Ag and Cu nanoparticles without the use of a sacrificial agent or hole scavenger. Isotope-labeled mass spectrometry was used to verify the origin and identity of the reaction products. Under 2 h AM1.5G 1-sun illumination, the total rate of hydrocarbon production (methane + ethane) was highest for AgCu-TNTA with a total CxH2x+2 rate of 23.88 μmol g–1 h–1. Under identical conditions, the CxH2x+2 production rates for Ag-TNTA and Cu-TNTA were 6.54 and 1.39 μmol g–1 h–1, respectively. The ethane selectivity was the highest for AgCu-TNTA with 60.7%, while the ethane selectivity was found to be 15.9 and 10% for the Ag-TNTA and Cu-TNTA, respectively. Adjacent adsorption sites in our photocatalyst develop an asymmetric charge distribution due to quadrupole resonances in large metal nanoparticles and multipole resonances in Ag–Cu heterodimers. Such an asymmetric charge distribution decreases adsorbate–adsorbate repulsion and facilitates C–C coupling of reaction intermediates, which otherwise occurs poorly in TNTAs decorated with small metal nanoparticles.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Similar to 1991 Et4N-Re2 Cl8 the Greatest disordering in Cluster compounds ever seen (20)
MACROMOLECULAR COMPOUNDS AND GELS. A manual for students and graduate students of biotechnology training and medical universities (in Russian) Authors: Belova EV, German KE, Afanasyev AV, Slyusar OI, Solodova EV
2018 History of technetium studies in Russia Anna KuzinaKonstantin German
Lecture is about the History of technetium studies in Russia and Anna Kuzina 100 anniversary of birthday
Technetium separation in milligram, gram and kilogram ammounts 1957 - 1993
Proceedings and selected lectures 10th intern symp technetium rheniumKonstantin German
Proceedings and selected lectures of the 10th International Symposium on Technetium and Rhenium – Science and Utilization, October 3-6, 2018 - Moscow – Russia, Eds: K. German, X. Gaona, M. Ozawa, Ya. Obruchnikova, E. Johnstone, A. Maruk, M. Chotkowski, I. Troshkina, A. Safonov. Moscow: Publishing House Granica, 2018, 518 p.
ISBN 978-5-9933-0132-7 December 2018
Aleksey Buryak. WELCOME ADDRESS FROM IPCE - RUSSIAN ACADEMY OF SCIENCES Andrey Romanov. WELCOME ADDRESS FROM THE MINISTRY OF SCIENCE AND HIGHER EDUCATION OF RUSSIAN FEDERATION Mikhail Igorevich Panasyuk. ANNA KUZINA: BIOGRAPHY. K.E. German. PROF. ANNA FEDOROVNA KUZINA – 100TH ANNIVERSARY OF BIRTHDAY T. Yoshimura, M. Seike, H. Ikeda, K. Nagata, A. Ito, E. Sakuda, N. Kitamura, A. Shinohara PHOTOLUMINESCENCE SWITCHING OF NITRIDORHENIUM(V) COMPLEXES B. Grambow, X. Gaona, W. Runde, R. Konings, A.V. Plyasunov, L. Rao, A.L. Smith, E. Moore, M.-E. Ragoussi, J. Martinez-Gonzalez, I. Grenthe. CHEMICAL THERMODYNAMICS OF TECHNETIUM IN THE OECD/NEA UPDATE VOLUME E.S. Kulikova, Zh.K. Majed, D.V. Drobot, E.I. Efremova. HIGHLY SELECTIVE CATALYSTS BASED ON BIMETALLIC RHENIUM-RUTHENIUM COMPLEXES OBTAINED BY ALKOXYTECHNOLOGY E.S. Kulikova, D.V. Drobot, E.I. Efremova. THE FIRST EXAMPLE OF BI AND THREEMETALLIC ALKOXIDES CONTAINING RHENIUM AND RUTHENIUM T. Matsuzaki, H. Sakurai. A NEW PRODUCTION METHOD OF 99Mo BY MUON NUCLEAR TRANSMUTATION N. Budantseva, G. Andreev, A. Fedoseev THE U(VI), NP(VI) AND PU(VI) COMPLEXES WITH TcO4-, ReO4-. THE DIFFICULTIES IN ASSIGNING OF AnO22+ GROUPS VIBRATIONAL FREQUENCIES. J.S. McCloy, C. Soderquist, J. Weaver, Jason Lonergan. SPECTROSCOPIC STUDIES OF ALKALI PERTECHNETATES
Молекулы белков лежат в основе почти всех биологических процессов. Ученым всегда были любопытны как белки, участвующие в метаболических путях, так и молекулярные основы их функционирования. Однако в эру системной биологии еще больше внимание уделяется полному пониманию работы всей совокупности белков организма, его протеома. Все более важно, что мы не только понимаем все стороны данной функции, или функций, какого-либо белка, но и то, что наше знание распространяется на все компоненты изучаемой системы или организма и так далеко, насколько это возможно. Без всестороннего анализа информации попытки синтеза и расчетов не смогут выйти за рамки приближенной реальности.
Книга "Структура и функционирование белков: Применение методов биоинформатики" представляет собой уникальный обзор современного состояния вопросов моделирования структуры белков и предсказания их функции. Книга написана ведущими специалистами в своей области, прекрасно иллюстрирована и содержит ссылки на доступные серверы и другие ресурсы, которые читатель, возможно, захочет использовать в своей научной работе. В конце каждой главы описываются перспективы развития и наиболее актуальные проблемы соответствующих областей науки.
Физико-химические методы исследования в медицине и биологии: Учебное пособие / Медицинский университет Реавиз. Москва, Издательство «Граница», 2016. 120 с.
Данное учебное пособие написано в соответствии с содержанием Государственных образо-вательных стандартов и программой дисциплины “Физико-химические методы анализа” по специальности “Медицина”, направлению и программой большого практикума (раздел “Физикохимические методы анализа”), который выполняется студентами по специальности “Биология”.
В нем изложены основы физико-химических методов анализа. Рассмотрены условия и области применения методов, их достоинства и недостатки, ограничения, перспективы развития и другие особенности и характеристики.
В конце каждой главы дано описание практических работ, приведены контрольные вопросы.
Предназначено для студентов-медиков, биологов, химиков, аспирантов, научных работников и учителей школ.
2016 rsc-advance-tc-c-qinggao wang - 6 pp 16197-16202Konstantin German
We analyze the formation of transition metal (TM) carbides, as determined by the strength of TM–TM and
TM–C bonds, as well as lattice distortions induced by C interstitials. With increasing filling of the d-band of
TMs, TM–C bonds become increasingly weak from the left of the periodic table to the right, with fewer and
fewer C atoms entering the TMs lattice. Technetium (Tc) turns out to be a critical point for the formation of
carbides, guiding us to resolve a long-standing dispute. The predicted Tc carbides, agreeing with measured
X-ray absorption spectra, should decompose to cubic Tc and graphite above 2000 K. Consequently, we
show that what has been claimed as TcC (with rocksalt structure) is actually a high-temperature cubic
phase of elemental technetium.
своевременная диагностика и терапия данного заболевания до сих пор являются нерешенной клинической задачей. По данным на 2011 г., заболе-
ваемость раком простаты в России составила 10,7% (40 тыс. первичных случаев) мужского населения, причем в 60% случаев заболевание диа-
гностировали на поздней (III–IV) стадии, когда неизбежен процесс активного роста и распространения метастазов. Методы анатомической
визуализации при диагностике данного заболевания имеют низкую чувствительность и специфичность. Методы метаболической визуализации,
использующие в качестве маркера простатспецифический антиген (ПСА), также малоэффективны. В качестве маркера для диагностики и
лечения метастатического рака простаты предлагается рассматривать простатспецифический мембранный антиген (ПСМА). За рубежом
проходят клинические испытания наиболее перспективные диагностические радиофармпрепараты на основе малых пептидных молекул, моди-
фицированных мочевиной, которые отличаются наибольшим сродством к ПСМА. Отличительной особенностью этих соединений является их
благоприятная фармакокинетика, высокое и длительное накопление в опухоли и метастазах, быстрое выведение из организма.
Ключевые слова: метастатический рак предстательной железы, простатспецифический мембранный антиген, радиофармпрепараты.
(Для цитирования: Власова О.П., Герман К.Э., Крылов В.В., Петриев В.М., Эпштейн Н.Б. Новые радиофармпрепараты для диагности-
ки и терапии метастатического рака предстательной железы на основе ингибиторов простатспецифического мембранного антигена.
Вестник РАМН. 2015; 70 (3): 360–365. Doi: 10.15690/vramn.v70i3.1334)
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
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students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
A Strategic Approach: GenAI in EducationPeter Windle
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This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
1991 Et4N-Re2 Cl8 the Greatest disordering in Cluster compounds ever seen
1. SYNTHESIS AND !?l”RUCITJRE OF TETRAETHYLAMMONIUM
~ACHLORODIRHENATE(II)
K. fi. German, M. S. Grigor’ev, F. A. Cotton, S. V. Kryuchkov,
and L. Falvello UDC 548.736
The compound [(C2Hs),N12(Re2C&J (I) has been synthesized by means of the reduction of
[(C~H~)4N]z/ReO~J by molecular hydrogen under a pressure of -3 MPa in an autoclave in a medium
of concentrated hydrochloric acid at a temperature of MOT. An x-ray structural investigation of I
has been carried out on a CAMS autodiffractometer fMo Ku radiation, graphite monochromator.
o-20 scanning, R < 20 < 50. 1938 reflections with I > lo(l)]. and the structure has been sdved by
the direct method and refined by the full-matrix least-squares me&d to R, = 0.0539 and R, =
0.0568. The structure of I is characterized by strong crystallographic disordering of the cations and
anions, which correlate with one another. The principal interatomic distances in stnrcture I are close
to the analogous distances in closely related compounds.
At the present time the most convenient and widely used methods for synthesizing compounds with [ReQsJ*- anions
are: the reduction of perrhenates by molecular hydrogen under pressure in an autoclave in a medium of hydrochloric acid at
a temperature of -WC [l-7] and the reduction of perrhenates in a hydrochloric acid solution with the aid of hypophos-
phorous acid [a-lo]. The other synthesis methods are generally based on the use of reactions of inaccessible compounds, are
more tedious, or have a low yield [6, 71. According to the data in [3, 41, the reduction of perrhenatea in an autoclave under
the conditions indicated above is completed with the formation of approximately equimolar quantities of [ReClJ2- and
[ Re&l,]*- . However, it was shown in [ll-141 that the maximum reducing power of systems consisting of H2 (3-5 MPa) and
HCl (3-6 M) in the autoclave synthesis of cluster compounds of technetium is observed at a temperature of lW-22OC and that
the formation of technetium(W) compounds as the final products under these conditions is apparently stipulated only by the
low solubility of these compounds with certain cations. Thus, it was theorized that in the case of rhenium, as in the case of
technetium, there is no need to raise the temperature of the autoclave to 300% or more to obtain octachlorodirhenate anions
(as well as other cluster compounds of rhenium) and that it is sufficient to select cations which are such that the solubility of
all the intermediate mononuclear reduced species would be sufficiently high and they would not precipitate. The present
work was devoted to the experimental verification of this idea,
The selection of cations which can be used in the autoclave synthesis of octachlorodirhenate anions was based on the
fact that most tetraethylammonium complex compounds of technetium have a high volubility in concentrated hydrochloric
acid solutions 113. 141 and readily undergo reduction in an autoclave to bi- and polynuclear clusters. Therefore, similar
behavior on the part of tetraethylammonium compounds of rhenium could be expected. Already the first trial experiments
confirmed this hypothesis, and the samples of [(CsHJ,Nh[RqCI,] synthesized have been used to synthesize other cluster
compounds of rhenium.
For example. the problem of synthesizing a compound with the [Re&ls]3- anion was posed on the basis of the analogy
to technetium. As we know. this problem is of crucial importance for the chemistry of Re-Re multiple bonds [6], since there
has not been any structural investigation of d4-d complexes of rhenium without bridging ligands. In [15] cobaltocene in an
acetone solution was used for the one-electron reduction of d-d complexes of rhenium. However, d-8 rhenium
complexes suitable for an x-ray structural investigation were not obtained. Therefore, an attempt was made to use fermcene
for this purpose. Unfortunately, the tiny acicular crystals presumably of d4-d5 complexes of rhenium which formed with a
small yield as a result of the reaction of acetone solutions of [(&H&,Nk[RqCls] and fetrocene were amorphous to x rays.
However. the search for a single crystal of this compound led to the discovery of a single crystal of the original rhenium
complex, which, unlike the product formed directly in an autoclave, had suitable characteristics for an x-ray structural
investigation. It was decided to carry out an x-ray structural experiment, since the structure of the compound
Institute of Physical Chemistry, Academy of Sciences of the USSR. Texas A & M University, College Station, Texas,
U.S.A. Translated from Koordinatsionnaya Khimiya, Vol. 17, No. 9, pp. 1230-1236. September, 1991. Original article
submitted November 1.1990.
0364-4626/91/1709-0663.$12.50 81992 Plenum Publishing Corporation 663
2. c
[(~Hs),Nh[Re&] was of special structural interest in connection with the study of the statistical disordering of similar
complexes [la]. The results of the investigation of the ferrocene derivative will be published separately.
The starting compound for the synthesis of [(C;H,),Nk[Re&lsJ(I) was tetraethylammonium perrhenate. which was
obtained according to a method similar to the method used to obtain [(~Hs),N][TcO,] [173. A weighed portion of 7-8 g of
[(CrH,),N][ReO,] was placed in a quartz test tube, 30 ml of concentrated hydrochloric acid were added, and the test tube was
closed by means of a quartz cover and placed within a steel autoclave with a working volume equal to 250 ml. Tbe design of
the autoclave and the method used to operate it did not differ from those described in 111. 18, 191. The initial hydrogen
pressure was -3 MPa. the time needed to establish the assigned working temperature (13OT) was 2 h, the holding time at
that temperature was 5 h, and the cooling time of the autoclave was -12 h. The yield of the turquoise, finely crystalline
precipitate, which was dried on ashless filter paper in an atmosphere of air, was equal to w0 of the theoretical amount.
According to x-ray powder diffraction analysis. the precipitate did not contain foreign impurities. After the blue mother
solutions (which contained mainly [ResCls]2- ions according to the data from optical spectroscopy) were evaporated in a
vacuum desiccator and were subsequently employed as the starting compounds for the synthesis of additional portions of
[(~H~),NJ.JRqClsJ, it was possible to increase the total yield of the final product to 80-90%. The crystals of
tetraethylammonium octachlorodirhenate(II1) recovered were not suitable for an x-ray structural investigation. A single
crystal of I suitable for this purpose was obtained as an admixture during an attempt to synthesize single crystals of
ferrocene-containing derivatives of rhenium, as described above.
The x-ray structural experiment was performed on a CAD4S diffractometer. The details of this experiment and the
principal crystallographic data for 1 are as follows:
Formula
M
Space group
.a. A
b. A
c, A
a, deg
B. deg
Y. de!
v. A3
~calc), g/cm3
Dimensions of the crystal, mm
u(Mo Ka). cm-
Transmission coefficient (max. min)
Monochromatic radiation
Orientational reflections
number
range (26)
Temperature, C
Scan technique
Range for data acquisition, 29, deg
Number of independent reflections
total
with I > lo(l)
Number of parameters in the leastsquares
refinement
RI
&
R%~aN2Cd-&o
916.53
(MO): k = 2n + 1, (ho1): h = 2?l+ 1,
(Ok& 1 = 2n + 1
14.027(2)
14. R%(2)
15.162(3)
90
90
90
3090.5(15)
4
2.029
0.15 x 0.2 x 0.3
89.02
0.9140, 0.6558
MO Ka (h = 0.71073 A)
25
2114 < 20 < 30.72
20+1
U-29
8<29<50
2621
1938
181
0.0539
0.0568
The structure of the compound was solved by the direct method according to the SHELXS-86 program and refined by
the full-matrix least-squares method with the use of the programs of the SDP system. The populations (p) of the atoms were
refined after the anisotropic refinement of all the nonhydrogen atoms: first with alternate fixation of the temperature
parameters and the populations and then with simultaneous refinement of the temperature parameters, coordinates, and
populations. After this the populations were normalized to unity on the basis of chemical arguments (and the values for the
carbon atoms were averaged). The last stage in the refinement of the structure was carried out with fixed values of the
populations @). The coordinates of the atoms, the temperature parameters, the populations of the atoms, the principal
3. TABLE 1. Coordinates, Populations, and Equivalent Temperature Parameters
of the Atoms in Structure I
Ice(l)
He (2)
Re (3)
Cl(l)
Cl(2)
Cl (3)
Cl (4)
N(l)
C(l)
“cl:;
c(i)
c (5)
c,w
E{J
C(l1)
C(U)
C(l5)
C(l7)
0,665 (I)
0,167(l)
0,159(l)
1
1
1
1
A,66 (2)
A,73 (2)
A.71 (2)
A.72 (2)
A.34 (2)
0,671
0.169
0,160
:
I
1
:,66
i.66
ii,66
:,66
:,<I,
o:ir4
0.34
0.34
x
0.03532(4)
0,0701(2)
-0,0116(2)
-0,0330(2)
-0,0637 (2)
0,1353(2)
0,1708(2)
U.6171(6)
0,530 ( 1)
0.4346 (9)
0.610(l)
0,699(l)
0.620(l)
0,607 ( 1)
0,712(l)
0.7269(S)
0,5ll(3)
0,686 (2)
0.628(3)
O,G30(4)
Y
0,56908(3)
0.4694 (2)
0,520, (1)
0,6172(2)
0,677l 2)
i0.5858 2)
0,5301(2)
0,604, (5)
0,612(l)
0,602 (1)
0,684 (1)
0,694 (I)
0.510(l)
0.422 l(7)
0.610(l)
0,7010(Y)
0.622 (2)
0.609 (3)
0.500 (3)
0,686 (2)
*
0,48842 (3)
0,5173(2)
0,5694 (2)
0,3547 (2)
0.5574 (2)
0,6099 (2)
0,4079 (2)
0,3616(5)
0,301(l)
0.341i(S)
0,433(i)
p;W;’
0:356(l)
0.303 (1)
$zl;;;jf)
0:443 (2)
0,314 (3)
0,289 (2)
8-p A2
22134:16(5)
% IFi{
6:os (6)
5.75 (5)
ii*; 12;
9:7 (4)
8,8 (5)
11,7(4)
7,0(4)
%~i
9:4(4)
8.2 (9)
9(f)
17(l)
13(i)
interatomic distances, and the bond angles are presented in Tables 1 and 2, and the anions and cations in structure I are
depicted in Fig. 1.
Compound I is built up from tetraethylammonium cations and centrosymmetric [RqCl,]2- anions, and the principal
bond lengths and angles differ only slightly from the analogous characteristics in closely related compounds [6. 201. However,
the crystal structure of this compound is characterized by an unusual type of crystallographic disordering of the cations and
anions (Fig. 1). It is seen from the results presented (Table 2) that this occurs owing to the proximity of the shape of the
[Re$18]2 anions to a regular cube with the chlorine atoms at the vertices, as well as owing to the mobility of the carbon
chains in the tetraethylammonium cations. It should be noted that the populations of the different crystallographic positions
of the anion (pit+) = 0.671, pR42) = 0.169. uR43) = 0.160) correlate well with the populations of the crystallographic positions
of the cation @CCL 3.~7) = 0.F PCUI. 13.1~. 17) = 0.34). and it is natural to assume that the variant of the cations with
C(1. 3 5, 7) atoms corresponds to the occupied Re(1) position and that the cations with C(l1. 13, 15, 17) atoms correspond to
Re(2) and Re(3) positions.
In order to account for these effects, the values of the intermolecular contacts of the cations and anions (Table 2)
should be examined in greater detail. It is seen from the data presented that most of the intermolecular contacts of the Cl...C
type fall within the range between 3.64 and 4.0 A. which corresponds to the normal length of these contacts in such
compounds [21]. However, there are two shortened contacts, viz., Cl(4)...C(15) and Cl(2)...C(4). the latter corresponding to a
contact between a chlorine atom and an outer carbon atom, which is not crystallographically disordered. Thus, in the
centrosymmetric cube of chlorine atoms we can single out four atoms, two of which [Cl(2) and (J(2))] always have shortened
contacts, while the other two [Cl(4) and C](4)] have shortened contacts only in cases in which the Re(2) or Re(3) position is
occupied. The three orientations of the anion are equivalent with respect to the Cl(2) and Cl(2) atoms, and when the contacts
formed by the Cl(4) and Cl(4) atoms with the C(15) atom are taken into account, the inequivalence between the Re(1) atom
and the Re(2) and Re(3) atoms becomes evident, but the Re(2) and Re(3) atoms remain equivalent. We note that the
shortening of the Cl...C contacts indicated above should be accompanied by significant distortion of the [Rc$l,]2- anions [the
mean-square length of the Re+Zl bonds in the [Re&ls~- anions calculated on the basis of the literature data [22] is 2.333(12)
A] in all three of its orientations due to the shortening of the Re(l)-Cl(2) bonds or the lengthening of the Re(2)-Cl(2) and
Re(3)-Cl(4) bonds. Since in the ideal case of the shape of the [Re$ls]2- anion in the form of a regular cube, all three
orientations of the anion would be equivalent, everything which was stated above allows us to conclude that the [Re&J2-
anion avoids the orientation in which the Re atoms are located in a single plane with four Cl atoms having shortened contacts
with carbon atoms to the greatest extent. The detailed mechanism of this phenomenon, however, is unclear.
The type of structural disordering under consideration was first described for rhenium compounds in the case of
[(C,H9),NJs[Re+Zl,] [23]. Similar structural disordering was also discovered in other binuclear complexes of rhenium [16,22,
24-261, molybdenum [271. and technetium [21]. Disordering of the structure in compounds with mobile tetrabutylammonium
cations has been noted in mononuclear [17, 28, 291 and polynuclear complexes of technetium [30]. We note that triaxial
disordering of the anions {similar to that observed in the case of [(C,H9),Nk[Re&ls]} was found only in the structures of the
compounds [(DMFAhHJJRezBrs] [22], [(C,Hs)4NMRr&] [24], and [(C,Hs),Nk[TcC&] [21]. equally probable populating of the
three crystallographic positions of the anions being observed in the iodide complex and possibly in the technetium complex.
The effects of crystalline disordering were examined most thoroughly in [16], but the data from the present work introduce
4. TABLE 2. Principal Interatomic Distances and F3ond Angles in Structure I
Re(l)-Re(1)’
Re(l)-U(2)
He (I)--Cl (4)
He @j-cl(i)
Re(2) -Cl (3)
Re(3)-Re(3)’
He(3)-Cl(2)
Re(3)-U(4)
N(l)-C(3)
N(l)-C(7)
N(l)-C(l3)
N(l)-C(l7)
C(2)-C(l1)
C(4)-C(1.7)
C(G)-C(l5)
C(8)-C(l7)
U(4)-C(2)
Cl(l)-C(6)
Cl(l)-C(X)
a(l)-c(l5)
(:1(2)-C(3)
cl(z)-C(6)
Cl(2)-C(l1)
Cl(3)-C(1)
U(3)-C(4)
C1(3)-C(G)
U(3)-C(13)
Cl (4)-C(2)
Cl(4)-C(7)
C](4)-C(l5)
Angle
d, A
2.2146(7)
2,312(3)
2,324 (2)
2,352 (3)
2.347 (3)
2,208 (3)
2.331(3)
2.370(3)
1.56 (2)
l-59(2)
1.57 (4)
l&O(3)
:*:g;
1:30 (4)
1,46(5)
3.99 (2)
2,79(2)
3,87(l)
9.79 (4)
3.65 (2)
3,75(l)
3.83 (3)
3.73(l)
3.il(l)
XG5 (2)
3.81(4)
3.97 (I)
3,81(2)
3,45(4)
102,09(6)
l,o;,;V;,
87:05 (9)
152.20 (9)
101.6(l)
%:((:;
155,3(l)
90.2 (I)
102.1 (I)
103.0(l)
155.1(l)
85,9(l)
no,1 (1)
108(l)
;:‘;i”,r’
105 (2)
105(2)
110(Z)
118(l)
:::I:;
121(3)
Re(I)-Cl(l)
Re(l)-Cl(3)
Re(2)-Re(2)’
Re(2)-Cl(2)
Re (2) -Cl (4)
Re(3)-Cl(l)
He (3) -Cl (3)
N(l)-C(I)
N(I)-C(5)
N(l)-C(l1)
N(I)-C.‘(G)
C(I)-C(2)
C(3)-C(4)
C(5)-C(c)
C ( i ) - C ( H )
Cl(I)-C(1)
Cl(l)-C(3)
Cl(l)-C(7)
Cl(l)-C(l1)
Cl(I)-C(17)
Cl(‘)-C(4)
Cl(2) -C(X)
U(2)-C(17)
Cl (3) -c (2)
Cl(3)-C(5)
Cl (3) -C(i)
cl(:~)-c(l5)
CI (4) -c (4)
Cl(G)-C(l3)
Angle
Re(l)‘Re(l)Cl(2)
Re(l)‘Re(I)Cl(4)
Cl(l)Re(l)Cl(3)
C1(2)Re(l)Cl(:O
C1(3)Re(l)Cl(4)
Re(2)‘Re(2)Cl(2)
Re(2)‘He(P)Cl(4)
Cl(l)Re(2)Cl(3)
C1(2)Re(2)Cl(3)
C1(3)Re(2)Cl(4)
Re(3)‘Re(3)Cl(Z)
Re (3) ‘Re (3) Cl (4)
Cl(l)Rc(3)Cl(3)
Cl (2) He (3) Cl (3)
Cl (3) He (3)CI (4)
C(l)Iv(l)C(5)
C(FqN(I)C(S)
C(J)N(l)C(7)
C(ll)N(l,C(lS)
c(13)rK(I)c(I;)
C(l5)N(l)C(Ii)
N(I)C(.3jC(6)
N(l)C(i)C(H)
Iv(l)C(l3)C(4)
K(l)C(l7)C(8)
d. A
2,344 (3)
2.327 (3)
2.21 I (3)
2,357 (3)
y; I;;, ,
p;yg,
1:Si (2)
1,63(4)
l&5(4)
l/18(2)
1,53(2)
1,52(2)
1,49(2)
4,oo (2)
:qi4 (2)
3.67 (2)
X79(3)
3.73(4)
3.49 (2)
3.80 (I )
3.li4 (3)
3,GG(l)
3.70(2)
3,74 (2)
3,72 (5)
3.!)ti(l)
:mJ (4)
103,8G (5)
103.94(7)
154.42(!1)
86,41(9)
8Ix)5(!))
101.2(l)
IWO(l)
87.5(I)
150.3(l)
W.l(l)
102.9(l)
101.4(l)
“8:*;;:i
155k(l)
113(l)
105,8(g)
107(I)
113(2)
10!,(2)
1 lO(2)
114(l)
115(l)
121(3)
116(3)
even greater uncertainty into the conclusions regarding the causes and laws of these effects, indicating that further study of
this phenomenon is needed.
Thus, although an analysis of the available results does not make it possible to draw unequivocal conclusions regarding
the laws and causes of the observed crystallographic disordering of the type under consideration at the present time, it may be
stated that a great tendency for it is apparently displayed by compounds with large (relative to the dimensions of the anion)
mobile cations, which tend to achieve the most compact type of packing in the crystal cell, as well as anions which
simultaneously have a ligand environment with high symmetry and some internal substructure (for example, the pseudocubic
Re.j&~ anion). At the same time, it was noted in [SO] that pseudo-octahedral [Tc&-Cl)&,]*- cluster anions are capable of
suppressing the statistical disordering of even such mobile cations as [(C,H,),N]+. This is attributed to the fact that the
packing of such very bulky anions in space may result in the formation of very large voids, whose dimensions may be
sufficient for accommodating even such bulky cations as tetrabutylammonium ions.
5. Fig. and1. Diagrams of the statistical disordering of the [Re&l,]*- anions (a)
the [(qH,),N]+ cations (b) in structure I.
We thank Nobel laureate Prof. R. Hoffmann (Cornell University, Ithaca, New York, U.S.A.) for organizing the
scientific cooperation between our teams and for taking an interest in the work.
LITERATURE CITED
1. A. S. Kotelnikova and V. G. Tronev. Zh. Neorg. Khim., 3, No. 4, 1008 (1958).
2. P. A. Kozmin. G. N. Novitskaya, V. G. Kuznetsov. and A. S. Kotelnikova. Zh. Strukt. Khim.. 12. No. 4.923 (1971).
3. A. S. Kotelnikova, M. I. Glinkina, T. V. Misailova, and V. G. Lebedev, Zh. Neorg. Khim., 21, No. 4, loo0 (1976).
4. A. S. Kotelnikova. T. V. Misailova, I. Z. Babievskaya, and V. G. Lebedev, Zh. Neorg. Khim.. 23. No. 9. 2402 (1978).
5. F. A. Cotton, N. F. Curtis, B. F. G. Johnson, and W. R. Robinson, Inorg. Chem., 4, No. 2, 326 (1965).
6. F. A. Cotton and R. A. Walton, Multiple Bonds Between Metal Atoms, Wiley, New York (1982) [Russian translation:
Mir. Moscow (19&j)].
7. G. Brauer (editor), Handbuch der prtiparativen anorganischen Chemie, Vol. 3. 3rd edn., Ferdinand Enke Verlag,
Stuttgart (19gl) [Russian translation: Mir, Moscow (1985)].
8. F. A. Cotton, N. F. Curtis, and W. R. Robinson, Inorg. Chem.. 4, No. 12, 16% (1965).
9. R. J. H. Clark and M. L. Franke, J. Am. Chem. Sot.. 98. No. 10.2763 (1976).
10. W. K. Bratton, F. A. Cotton, M. Debeau, and R. A. Walton, J. Coord. Chem., 1, No. 1, 121 (1971).
11. V. I. Spitsyn, A. F. Kuzina, A. A. Oblova, and S. V. Kryuchkov. Usp. Khim., 54. No. 4,637 (1985).
12. S. V. Kryuchkov. Dissertation for the degree of Candidate of Chemical Sciences, Institute of Physical Chemistry,
Academy of Sciences of the USSR, Moscow (1983).
667
6. 13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
S. V. Kryuchkov (Kryutchkov), A. F. Kuzina, and K. E. German, in: Abstracts of Papers, 3rd International
Symposium on Technetium in Chemistry and Nuclear Medicine.Padova. Italy, 1989; J. Nucl. Med., 33.295 (1989).
S. V. Kryuchkov (Kryutchkov), A. F. Kuzina. and K. E. German, in: M. Nicolini. G. Bandoly, and U. Mazzi
(editors), Technetium and Rhenium in Chemistry and Nuclear Medicine, Raven Press, New York (1990). p. 275.
K. R. Dunbar and R. A. Walton, Inorg. Chem.. 24, No. 1.5 (1985).
F. A. Cotton, A. C. Price, R. C. Torralba, and K. Vidyasagar, Inorg. Chim. Acta, 175. No. 2,281 (1990).
K. 8. German, M. S. Grigorev. A. F. Kuzina, and V. I. Spitsyn. Zh. Neorg. Khim., 32, No. 4,1089 (1987).
M I. Glinkina. A. F. Kuzina. and V. I. Spitsyn, Zh. Neorg. Khim.. 18, No. 2,403 (1973).
V. I. Spitsyn, A. F. Kuzina, A. A. Oblova, and L. I. Belyaeva. Dokl. Akad. Nauk SSSR, 237. No. 4.1126 (1977).
P. A. Kozmin and M. D. Surazhskaya, Koord. Khim., 6, No. 5,643 (1980).
S. V. Kryuchkov and M. S. Grigorev, Koord. Khim.. IS, No. 10, 1343 (1989).
P. A. Kozmin. Koord. Khim.. 12, No. 5, 647 (1986).
F. A. Cotton, B. A. Frenz, B. R. Stults, and T. R. Webb, J. Am. Chem. Sot., 98, No. 10.2768 (1976).
F. A. Cotton, L. M. Daniels, and K. Vidyasagar. Polyhedron, 7, No. 9, 1667 (1988).
F. A. Cotton and L. M. Daniels, Inorg. Chim.Acta, 142. No. 2. 255 (1988).
H. W. Huang and D. S. Martin, Inorg. Chem.. 24. No. 1, 96 (1985).
J. V. Brencic and F. A. Cotton, Inorg. Chem.. 8. No. 1, 7 (1%9).
F. A. Cotton, L. M. Daniels. A.,Davison. and C. Orvice, Inorg. Chem.. 20. No. 9, 3051 (1981).
V. I. Spitsyn, A. F. Kuzina, K. E. German, and M. S. Grigorev. Dokl. Akad. Nauk SSSR, 293, No. 1, 101 (1987).
S. V. Kryuchkov, M. S. Grigorev. A. F. Kuzina, et al.. Dokl. Akad. Nauk SSSR. 290. No. 4, 865 (1986).
668