Tin-119 Fourier-transform nuclear magnetic resonance study of rhodium–tin complexes formed in aqueous hydrochloric acid solutions of RhCl3and SnCl2

Abstract
Rhodium–tin complexes, formed in aqueous hydrochloric acid solutions of RhCl3 and SnCl2, have been investigated by 119Sn Fourier-transform n.m.r. spectroscopy. Satellite peaks due to the 117Sn isotope revealed fast intramolecular scrambling of the ligands. The redox process between rhodium(III) and tin(II) species to form a rhodium(I) complex with five tin(II) ligands was demonstrated at a molar ratio of [Sn] : [Rh]= 6 : 1. Nuclear magnetic resonance properties of the rhodium(I) complex and of a series of [Rh(SnCl3)nCl6–n]3–(n= 1–5) complexes are determined and discussed.

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