Question:
what are fac and mer isomers? explain with diagram and examples..
Answer:
Octahedral complexes with a general formula MX 3 B 3 can exist in two isomers namely facial (fac ) and meridional (mer),
An example, fac and mer [Co(NH 3 ) 3 (NO 2 ) 3 ], CrF3I3
In case of CrF3I3, the mer isomer is where the ligands are not on the same plane and there exists a 90-90-180 degree bond angle between the 3 same ligands. The fac isomer is where the ligands are on the same plane and there exists a 90-90-90 degree bond angle between the 3 same ligands.
Fac-CrF3I3 -
mer-CrF3I3:
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