JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Coordination Compounds

Total number of relatively more stable isomer(s) possible for octahedral complex

[Cu (en)_{2} (SCN)_{2}]

will be

____

Answer: 3

Solution

For the octahedral complex

[Cu (en)_{2} (SCN)_{2}]

Two bidentate ethylenediamine (en) ligands occupy 4 coordination sites
Two monodentate thiocyanate (SCN) ligands occupy 2 coordination sites

Possible geometrical isomers:

cis-isomer: Both SCN ligands adjacent (90° apart)
trans-isomer: Both SCN ligands opposite (180° apart)

For the cis-isomer, the two en ligands can be arranged to give optical isomers (non-superimposable mirror images):

cis-Δ (dextro)
cis-Λ (levo)

The trans-isomer has a plane of symmetry and is optically inactive.

Total relatively stable isomers: 3 (cis-Δ, cis-Λ, and trans)

Structure cis-optical isomer — cis-optical isomer

JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Integer answer

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