Paper: CSIR-NET June 2014 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Medium
A 1: 2 mixture of $\mathrm{Me}_{2} \mathrm{NCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{PPh}_{2}$ and KSCN with $\mathrm{K}_{2}\left[\mathrm{PdCl}_{4}\right]$ gives a square planar complex A. Identify the correct pairs of donor atoms trans to each other in complex A from the following combinations.
(a)P, N
(b)N, S
(c)P, S
(d)N, N
Answer
Answer: A ✓ checked by 4AB · confidence medium
Answer: (a) P, N and (b) N, S.
Explanation
Answer: (a) P, N and (b) N, S — In square-planar Pd(II) with a P,N-chelate, symbiosis/antisymbiosis decides how SCN⁻ binds. It goes N-bound trans to the soft, strongly trans-influencing P, and S-bound trans to the hard amine N. The trans pairs are P–N(CS) and N–S(CN).