One dimensional solids have grown explicitly over the past few years owing to the striking similarities it gives along with conducting polymers as well as semiconductors. A relatively young field with great amount of scope for development with M--M multiple bonds the one dimensional solids

1. One Dimensional
Solids
Sri Sathya Sai Institute Of Higher Learning
17 September 2019
ABHINAV S
II M.Sc ( Chemistry)

2. “
■ Main Subject of interest is of planar
complexes Platinum and Iridium
arranged in infinite stacks
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3. 3

4.  By far the most successful approach to one-
dimensional physics are highly anisotropic
crystals.
 K2Pt(CN) 4.3H2O is white and non conducting.
 Pt valance integral is +2
 Pt---Pt distance so long that no M—M bond
effectively possible
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5. 5
Complex Pt
Valance
Pt---Pt Colour Conductivity
Pt metal 0 2.775 Metallic 9.4× 104
K2Pt(CN) 4.3H2O +2.0 3.48 White 5.0 × 104
K2Pt(CN)4Br0.3.3H2O +2.3 2.88 Bronze 4.830
K2Pt(CN)4Cl0.3.3H2O +2.3 2.87 Bronze 200
K1.75Pt(CN) 4.1.5H2O +2.25 2.96 Bronze 70 - 100
Cs2[Pt(CN)4](FHF)0.39 +2.39 2.39 Gold Unknown
Some tetracyanoplatinate compounds with stacked anions

6. 6
Complex Pt
Valance
Pt---Pt Colour Conductivity
Pt metal 0 2.775 Metallic 9.4× 104
K2Pt(CN) 4.3H2O +2.0 3.48 White 5.0 × 104
K2Pt(CN)4Br0.3.3H2O +2.3 2.88 Bronze 4.830
K2Pt(CN)4Cl0.3.3H2O +2.3 2.87 Bronze 200
K1.75Pt(CN) 4.1.5H2O +2.25 2.96 Bronze 70 - 100
Cs2[Pt(CN)4](FHF)0.39 +2.39 2.39 Gold Unknown
KROGMANN
SALTS

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(a) Reflectivity of K2Pt(CN) 4Br0. 3·H2O (abbreviated KCP) measured parallel
and perpendicular to the chains at different temperatures as indicated.
(b) Optical conductivity of KCP for E k stacks at T = 40 K.

8.  While in KCP the metallic properties are due to the platinum ions, organic
conductors form a class of solids with no metal atoms present (or relevant).
 Instead the π electrons distributed over of the entire organic molecule form
the orbitals which might overlap and lead to band-like conductivity.
 The additional degree of freedom, tailoring these molecules, supplements
the structural arrangement in the crystal and makes it possible to fine-tune
competing contributions for the desired properties.
 This makes organic materials superior for studying low-dimensional
physics and ordering phenomena in solids.
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9.  Partial oxidation of [Pt(ox)2] 2- with nitric acid or
peroxides give copper color needles containing
[Pt(ox)2] -1.64 cation defeicient has been studied
 Pt---Pt distance range 2.80 – 2.85 Å
 Properties comparable to cyano compounds
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10.  Halo Carbonyliridate compounds form 1D solids.
 Pt(II) isoelectronic with Ir(I) but greater spatial
extensions of d orbitals may allow stronger
interactions and better band formations.
 Pt---Pt distance so long that no M—M bond
effectively possible
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11.  No doubt, one-dimensional Chemistry matured from a toy
model to an extremely active
field of theoretical and experimental research, spanning a
broad range from quantum
gases to condensed-matter physics and semiconductor
technology.
 Several novel and exciting phenomena can be
investigated in these systems. In one-dimensional metals
collective modes replace the single-particle excitations
common to three-dimensional conductors
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12.  Planar complexes arrange in stacks to give infinite
chains of metal atom
 Optical properties of the crystal are anisotropic in
nature with strong absorption bands polarised in the
direction of the metal atom chains
 But M—M distances are long and they donot have
any intrinsic conductivity
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13.  Advanced Inorganic Chemistry, F Albert Cotton
and Goeffray Wilkinson , 4th edition, Wiley
Interscience Publications, pp 1110 - 1113
 Charge-Ordering Phenomena in One-
Dimensional Solids , Martin Dressel,
Festschrift DPI, 1–22
Herausgeber (ed.)
Universitatsverlag Gottingen 2007
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REFERENCES

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