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Thiosaccharinate binding to palladium(II) and platinum(II): Synthesis and molecular structures of sulfur-bound complexes [M(kappa1-tsac) 2(kappa2-diphosphane)]
Palladium(II) and platinum(II) thiosaccharinate complexes [M(kappa1-tsac)2{kappa2-Ph 2P(CH2)nPPh2}] (M = Pd, Pt; n = 1-4) have been prepared, palladium complexes from reaction of [Pd(tsac) 2]¡¤H2O with diphosphanes and platinum complexes from addition of thiosaccharin to [PtCl2{kappa2-Ph 2P(CH2)nPPh2}] in the presence of triethylamine. All complexes have been fully characterized and the crystal structures of [Pd(kappa1-tsac)2(kappa2- dppp)] (n = 3) and [Pt(kappa1-tsac)2(kappa 2-dppm)] (n = 1) have been determined confirming that thiosaccharinate ligands are S-bound. The larger ring complexes (n = 3, 4) are fluxional in solution being attributed to the conformational flexibility of the diphosphane backbones The bis(diphosphane) complexes, [M(kappa1- tsac)2(kappa1-dppm)2] (M = Pd, Pt), have also been prepared upon treatment of [Pd(tsac)2]¡¤H2O with two equivalents of dppm or addition of thiosaccharin to [Pt(kappa2-dppm)2]Cl2 in the presence of triethylamine in which the diphosphanes bind in a monodentate fashion. Both are highly fluxional in solution, changes in the 31P{1H} NMR spectra as a function of temperature being interpreted as the exchange of bound and unbound phosphorus atoms.
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Reference£º
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com