JEE Main · 2009 · 12 Apr 2009 · Offline · Coordination Compounds

Which of the following pairs represents linkage isomers ?

(A) $[Cu (NH_{3})_{4}] [Pt Cl_{4}]$ and $[Pt (NH_{3})_{4}] [CuCl_{4}]$
(B) $[Pd (P Ph_{3})_{2} (NCS)_{2}]$ and $[Pd (P Ph_{3})_{2} (SCN)_{2}]$ ✓ Correct
(C) $[CO (NH_{3})_{5} NO_{3}] SO_{4}$ and $[CO (NH_{3})_{5} SO_{4}] NO_{3}$
(D) $[PtCl_{2} (NH_{3})_{4}] Br_{2}$ and $[PtBr_{2} (NH_{3})_{4}] Cl_{2}$

Answer: (B)

Solution

Linkage isomers arise when an ambidentate ligand can bind through either of two donor atoms. Thiocyanate is just such a ligand, attaching through nitrogen as

NCS

or through sulfur as

SCN

. The pair of palladium complexes that differ only in whether the thiocyanate is bound as

NCS

or as

SCN

are therefore the linkage isomers.

JEE Main · 2009 · 12 Apr 2009 · Offline · Single correct option

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