1. Organometallic compounds are defined as compounds in which carbon atoms are directly bonded to metal atoms. Organometallic compounds can be classified as ionic, covalent, or electron deficient based on the nature of the metal-carbon bond. 2. Metal carbonyls are compounds where carbon monoxide ligands are bonded directly to metal centers. They can be mononuclear, containing one metal center, or polynuclear, containing multiple metal centers. Common mononuclear metal carbonyls prepared include nickel tetracarbonyl, iron pentacarbonyl, and chromium hexacarbonyl. 3. The document provides details on the nomenclature, classification, preparation, and structures

1. Organometallic Chemistry
B.Sc-III
VI-semester
Mr.G.M.Dongare(M.Sc,B.Ed,SET)
Associate Professor
Dept.of Chemistry
Shri Shivaji Science College,Amravati.
cell no. 9422712054,9021937649
email- infogmdongare@gmail.com

2. CONTENT OF TOPIC
1.Defination
2.Nomenclature
3.Classification of organometallic compounds
4.Metal Carbonyls.
5.Defination of Metal carbonyls
6. Preparation of Ni(CO)4,Fe(CO)5,Cr(CO)6.
7. Structure and Bonding
8.Questions for practices

3. Definition of organometallic compound-
Organometallic compounds are defined as
compounds in which carbon atom are directly
bonded to metal.
They have differences in electronegativities. The
compound consist of M δ+ - C δ- metal and carbon
atom more or less polar bonds.
Organometallic chemistry combines aspects of
inorganic chemistry and organic chemistry consist
of covalent nature of compound.

5. Nomenclature of Organometallic Compound
The Nomenclature based on σ- bonded and π-
bonded
The rules of nomenclature is similar in IUPAC
nomenclature of Coordination chemistry
Some additional rule-
1.The ligand named as alphabetically. 2.The
presence of hydrocarbon ligands in the
coordination sphere indicated as their radical(
methyl,ethyl.)

6. K[B(C6H5)4]- is named as potassium tetra phenyl borate(III)
K[SbCl5(C6H5)]- is named potassium pentachloro phenyl)antimonate(V)
K3[FeCN5(CO)]- is named potassium pentacyanocarbonyl Ferrate(III)
K[PtCl3C2H4]-is potassium trichloro ethylene platinate(II)
Mo(CO)3Mo(CO)3
Bis[tricarbonyl(1-6n5
Cyclopentadienyl)]Dimolybdenum
F e
( C O ) 3
12
3 4
T r i c a r b o n y [ 1 - 4 n 4
- c y c l o o c t a t e t r a e n e ) i r o
Pt
Cl Cl
Cl
H
H
H
H
Platinum trichloro(n5
-Ethylene) platinum

7. The classification of organometallic compound
based on the nature of Metal-Carbon bond i.e σ-
bonded and π-bonded
Classification of organometallic compound
Ionic- Ionic organometallic compounds are generally formed from elements such
as sodium, potassium etc. where the metals are considered electropositive with most
Group 1 elements.
Covalent - The simplest model of the M-C bond consists of essentially a single
covalent 2-electron bond. These compounds are often volatile and are comparable to
typical organic compounds being soluble in organic solvents with many Group 12,
13, 14 and 15 elements.
Electron deficient -Electron deficient organometallic compounds are generally
associated with elements that have less than half-filled valence shells and
insufficient number of valence electrons to allow all the atoms to be linked by
tradition electron deficient - with Li, Be, Mg, B, Al

8. Metal Carbonyl (M-CO)
Definition- When metal is directly bonded to carbon atom of carbon monoxide molecule
Ni(CO)4 tetracarbonylnickel,
The classification based on no.of metal atom attached with carbonyl grou of ligand
1) Mononuclear carbonyl - Ni(CO)4 tetracarbonylnickel, Fe(CO)5 –Pentacarbonyl Iron,
Cr(CO)6 –Hexacarbonyl Chromium . One metal linkend to carbonyl ligand
2) Polynuclear carbonyl- i.e Binuclear, Trinuclear carbonyl Co2(CO)8, Fe2(CO)9,
Fe3(CO)12 Mn2(CO)10 Two or more metal linked to carbonyl group.
Fe-Fe , Co-Co in bridge carbonyl system
F e
C O
C O
F e
O C
O C
O C
C O
C O
C O
F e 2 C O 9
C O
C o
C O
C O
C o
O C
O C
O C
C O
C O
C O
C o 2 C O 8

9. Preparation of Metal Carbonyl
Ni + 4CO
30o
c
1atm
Ni(CO)41.
2. Fe + 5CO
200o
c
200atm
Fe(CO)5
CrCl3 6CO
115o
c
70atm
Cr(CO)6
3.
LiAlH4
+

10. Properties of Metal Carbonyl
Physical properties Chemical properties
1. Colorless or pale yellow
2. Volatile
3. Inflammable and toxic
4. Soluble in polar and nonpolar
organic solvent
Co2(CO)8 2Na[Co(CO)4+Na2CO3+H2O
Tetrahydrofuran
Mn2(CO)10+2Li 2Li[Mn(CO)5
Fe(CO)5 [Fe(CO)4I2]
sodi.Tetracarbonycobaltate
LithiumpentacarbonylMangnate
IodotetracarbonylIron
+I2
Fe(CO)5
3NaOH
Na[HFe(CO)4+Na2CO3+H2O
sodiumtetracarbonylhydraideFerrate

11. Structure of Nickel tetra Carbonyl
4p3d 4s
Ni atom in ground state
Sp3
hybridisation
2D- 3D
Tetrahedral Structure of Ni (CO) 4

12. Structure of Iron Pentacarbonyl
2D 3D-
Trigonal bipyramidal Structure of Fe(CO)5
4p3d 4s
Fe atom in ground state
dsp2
hybridisation
-

13. Structure of Chromium hexacarbonyl
2D 3D-
Octahedral Structure of Cr(CO)6
-
4p3d 4s
Cr atom in ground state
d2
sp3
hybridisation

14. Question
1. Define the organometallic compound & give the classification organometallic
compound
2. Define the metal carbonyl and what are types of metal carbonyl give one example of
each
3.How will you prepare the mononuclear metal carbonyl.
4.Describe the structure of Nickel tetra carbonyl, Iron pent carbonyl and Chromium hexa carbonyl