(a) Which of the following octahedral complexes are chiral: cis-[CoCl2(en)2]+, [Cr(ox)3]3–, trans- [PtCl2(en)2]2+, [Ni(phen)3]2+, [RuBr4(phen)]–, cis- [RuCl(py)(phen)2]+?
(b) The solution 3lP NMR spectrum of a mixture of isomers of the square planar complex [Pt(SCN)2(Ph2PCH2PPh2)] shows one broad signal at 298 K. At 228 K, two singlets and two doublets (J = 82 Hz) are observed and the relative integrals of these signals are solvent-dependent. Draw the structures of the possible isomers of [Pt(SCN)2(Ph2PCH2PPh2)] and rationalize the NMR spectroscopic data.
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