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Unusual Coordination Assemblies from Platinum(II) Thienyl and Bithienyl Complexes

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posted on 27.09.2003, 00:00 by Peili Teo, L. L. Koh, T. S. Andy Hor
Dinuclear Pt2Br2(dppf)2(μ-C8H4S2) exchanges with isonicotinic acid to release free bithiophene and gives a molecular square [Pt4(dppf)42-O2CC5H4N)4]4+4OTf- which is an “all-ring” system with four Pt rings disposed at the corners of a larger macrocyclic ring. The related mononuclear complex PtBr(η1(C2)-C4H3S)(dppf) reacts with AgOTf (OTf = triflate) to give [Pt2(dppf)221(C),η1(S)-C4H3S)2]2+2OTf- with an unusual six-membered ring formed by the fusion of two Pt−thienyl entities at the sulfur sites. All the complexes are structurally characterized by single-crystal X-ray crystallography.