coordination complexes

1. WELCOME

2. Optical isomerism
the isomers display identical characteristics in terms
of molecular weight as well as chemical and physical
properties
have the same molecular and structural formula
they are mirror images of each other and should be
dissymmetric.
cannot be superimposed on each other
Optical isomers should not have a plane of symmetry
 differ in their effect on the rotation of polarized light

3. • Optical isomers are those two compounds
with the same chemical formula such that
their mirror images are not superimposable
on each other.
• Depending on the direction they rotate the
plane of polarised light ,we have two forms of
optical isomers.
• Dextro Isomer: This rotates to right.
• Laevo Isomer: This rotates to left.

4. They are said to be
“chiral” (handed) and referred to as enantiomers of
each other.

5. • Optical isomers are usually associated with
tetrahedral or octahedral geometries in metal
complexes. Square planar complexes don’t
show optical isomerism except for some rare
examples.

6. Optical isomerism in Square Planer Complexes
• Square planer complexes are generally achiral
since molecular plane of the complex acts as a
plane of symmetry. So optical isomerism is
rare in square planar complexes
• But optical isomerism may appear in square
planar complexes having (i) an asymmetric
ligand or (ii) specially chosen bidentate
ligands.

7. .
Having an asymmetric ligand.
• For example, a platinum(II) complex with N-
methyl-N-ethyl glycine ligand, having
asymmetric nitrogen center show optical
isomerism

8. • Optical isomers are the stereo isomers that
are non superimposable mirror images of
each other and differ in the direction with
which they rotate plane-polarised light.
• They are said to be“chiral” (handed) and
referred to as enantiomers or enantiomorphs
of each other.

9. Optical isomerism in
tetrahedral Complexes
• Optical isomers are the stereo isomers that
are non superimposable mirror images of
each other and differ in the direction with
which they rotate plane-polarised light.
• They are said to be“chiral” (handed) and
referred to as enantiomers or enantiomorphs
of each other.

10. • Tetrahedral complexes of the type, Mabcd are
analogous to carbon bonded to four different
groups, and thus have optical isomers, but
not geometric isomers
• The optical isomerism is rarely observed in
tetrahedral complexes with four different
substituents because substituents in these
complexes are usually too labile for the
complex to be resolved, i.e., they racemize
rapidly and not possible to isolate

11. Tetrahedral Complexes with four
different substituents

12. THANK YOU