9.12 Write all the geometrical isomers of [Pt(NH3)(Br)(Cl)(py)] and how many of these will exhibit optical isomers?
The complexes with the formula [Mabcd]n± can have three geometrical isomers For these isomers, cis and trans terminology is not applicable.
The complex [Pt(NH3)(Br)(Cl)(py)] has three isomers. The structures are as follows:
From the above isomers, none will exhibit optical isomers. The square planar structure has a plane of symmetry. Hence, square planar complex does not show optical isomerism.