Coordination

Compounds

µ
:L n'Thieme
"

Isomerism
field
Crystal Theory
Organometallic Compounds

I -2 Ols
 Werner 's Theory
0

In complex substance : central metal ion is surrounded

retains
by oppositely charged ions and
identity in
solutions .

According to Werner 's

Theory : metals possess
TWO TYPES OF VALENCIES -

I .

Primary Valency :
Ionic
covalent
2
Secondary valency
:
.
 TUPAC Nomenclature
• certain rules to be
followed
-

I . The
positive part of compound named
first followed
by negative part .

2 .

Ligands are named

followed by central metal .

prefix di tri tetra indicate each kind

no
of
:
, ,
.

of ligand present .

prefix
: bis ,
tris used when
fsolydendate ligands

3 .

ligands named in alphabetical order .

4 .
Oxidation state of central atom in roman No 's in

bracket .

complex central metal

5 . when has -
ve
charge : name of
ends in -
ate

for Anion
ligands : Name ends in 0

For Cationic name ium

ligands ends
: as

neutral
ligands
:
Regular Names

H2O =
Aqua
No =
nitrosyl
MHz = ammine

co =
carbonyl
 Isomerism

structural stereo

structural Isomerism
is .

Hydrate Isomerism
Differ in coordinated bound H2O .

( Co (H2O)6 Iz ) and Ccocnzo)ydz) I . 2420

2 . Ionisation Isomerism

Differ in ions released in solution

⇐ (Nns) , soy) Br and
@ (Nns) ,
Br ) soy

3 .

Linkage Isomerism
Differ in sites of coordination of ambient
ligand
⇐ (MDs model and founds (Ono)) I

4 . Coordination Isomerism
Differ in coordination spheres
@ (Nhs) 6) (counts) and [cocoons) 6) (crank )
 Stereoisomerism
1 .
Geometrical Isomerism

°
Tetrahedral complexes do not show
geometrical
isomerism .

•
Square planar complexes with
general formula
M Az Xz MABXY
M Az XY M ( AB)z
MAB Xa MCABCD)
show geometrical isomerism .

• Sn Octahedral complexes -

Auxz) ( MANY ] (m (AA)zX )

shows
geometrical isomerism
 and meridional
•
(MA 3×3) shows
facial type

2 .

Optical Isomerism

when CN = 4
Possible hybridisation
's
dsp
'
=
; sp

In case
of dsp
' -
No optical isomerism
On sp
's -

only possible when all 4

ligands are different
when CN -
-
6

"

Type I :
( ( )
m AA
,
Bz)

Type I :
(MIAA) ,]

Effective Atomic Number ( EAN)

C- AN = Own electrons of + electrons donated

central
by ligands
ion
 Hybridisation
certain Enamples :

"
1 .
(
Cr ( Nhs)¢ ) ion

"
Ear ) 3dB
Electronic
config of Cr =
n
2 . Hi Cco) u )
oxidation state Ni
of = zero

Crystal field Theory

VBT fails to explain magnetic and geometrical
properties of most
of compounds .

sphere central atom

surrounded
CFT assumes as + ve

by charged ligands
-
ve .

d lost
In CFT
degeneracy of orbitals is
-

.
 Decides stability of complex .

stable
strong field ligands complexes more
-

Inner d- orbitals more stable than outer orbital .

-
chelates (Ring forming ligands) are more stable .

Organometallic comped .

atleast metal
Compounds containing one carbon
-
•

bond .
I .
or bonded
organometallic compound
RMGX
Nez (MDG

2 A bonded
organometallic compound
-
.

3 .
o -
it bonded organometallic compound
Ni (co)y
Fe CCDs
Previous yrs Imm