Abstract
Abstract A new tripodal tetradentate ligand bearing one phosphine and three thioether moieties, [2-(i-PrS)C6H4]3P (1b), was synthesized by the reaction of [2-(i-PrS)C6H4]Li with PCl3 in good yield. Ligand 1b reacted with NiCl2·6H2O in the presence of NaBF4 to afford a five-coordinate complex, [NiCl(1b)]BF4 (2), with slightly distorted trigonal-bipyramidal geometry. Reaction of 1b with [PdCl2(PhCN)2] gave a five-coordinate complex, [PdCl(1b)]Cl (3a). Anion-exchange reaction of palladium(II) complex 3a with NaBF4 afforded [PdCl(1b)]BF4 (3b) with distorted trigonal-bipyramidal structure. Reaction of 1b with [PtCl2(cod)] resulted in the formation of a four-coordinate square-planar complex, [PtCl2(1b)] (4). The structures of 2, 3b, and 4 in crystalline state were determined by X-ray structural analysis and are described in detail. The structures of 2–4 in solution were also discussed.
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