Geometric
Isomers (cis / trans).
• These isomers result from different
relative positions of the ligands inside the coordination
sphere of a TM complex.
It excludes optical
isomers.
• Such isomerism cannot
occur for complexes of coordination numbers 2
and 3, nor for tetrahedral complexes with
coord. no. 4 since all
coordination
positions are adjacent to
one
another.