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  4. Which of the following complexes can also represent facial (fac) and meridional (mer) isomers?

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Q. Which of the following complexes can also represent facial (fac) and meridional (mer) isomers?

AMUAMU 2016Coordination Compounds

Solution:

$ [Co(NH_3)_3(NO_2)_3]$ complexes can also represent (fac) and meridional (mer) isomers. If three donor atoms of the same ligands occupy adjacent positions at the comers of an octahedral face, we have the facial (fac) isomer. When the positions are around the meridian of the octahedron, are get meridional (mer) isomer.
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