Chapter 133 of 2363 min read

Isomerism in coordination compounds

Why this is asked: Ambidentate ligands like NO₂⁻/ONO⁻ (nitro/nitrito) and SCN⁻/NCS⁻ give linkage isomers — same formula, different donor atom — a distinct category from ionisation isomerism, where a different ion sits inside versus outside the coordination sphere. For an MA₃B₃ octahedral complex, the geometrical isomers are called fac and mer, not cis/trans, which is reserved for the MA₄B₂ and MA₂B₂ patterns.

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Test yourself

•Match List I with List II.

List I (Complex)	List II (Type of isomerism)
A. $[Co (N H_{3})_{5} (N O_{2})] C l_{2}$	I. Solvate isomerism
B. $[Co (N H_{3})_{5} (S O_{4})] Br$	II. Linkage isomerism
C. $[Co (N H_{3})_{6}] [Cr (CN)_{6}]$	III. Ionisation isomerism
D. $[Co (H_{2} O)_{6}] C l_{3}$	IV. Coordination isomerism

Choose the correct answer from the options given below:

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