L1 /   
7
CH1012
STEREOISOMERS
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.
Cis/trans is defined in terms of 2 ligands of the same type