Controlling the Properties of a 2,2-bipyPlatinum Dichloride Complex via Oxidation of a Peripheral Stibine Moiety
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2018 American Chemical Society. Our interest in the chemistry of antimony derivatives has led us to investigate the synthesis and properties of 4-(diphenylstibino)-2,2-bipyridine (LSbPh2). This new ligand, which could be obtained by reaction of 4-lithio-2,2-bipyridine with Ph2SbCl, was treated with Pt(CH3CN)2Cl2 to afford the platinum complex LSbPh2PtCl2 (1). Interestingly, the latter reacts with PhICl2 to afford LSbCl2Ph2PtCl2 (2), a complex in which the peripheral stibine moiety has been converted into a dichlorostiborane. Complexes 1 and 2 have both been fully characterized. Computational, UV-vis, and cyclic voltammetry studies show that oxidation of the antimony atom leads to a lowering of the bipy-centered LUMO, indicating that 2 is more electron deficient than 1. A congruent picture emerges from reactivity studies, which show that 2 is a more active catalyst for the hydroarylation of ethyl propiolate by mesitylene.
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