Preparation, properties, and structures of bis(O-ethyl dithiocarbonato)-dihalogenotin(IV) and di-μ-thio-bis[bis(O-ethyl dithiocarbonato)tin(IV)]

Abstract

The complexes [Sn(S2COEt)2X2], X = Cl, Br, or I, have been isolated as stable crystalline compounds. The corresponding complexes [Sn(S2COEt)3X] and [Sn(S2COEt)X3] could not be isolated, it being postulated that the former rearranges to yield the dimeric compound [(EtOCS2)2SnS2Sn(S2COEt) 2]. Structure determinations carried out by single-crystal X-ray diffraction methods of [Sn(S2COEt)2Br2] and [Sn(S2COEt)2l2] show that in both cases the tin atom is six-co-ordinate with the halide atoms cis (Sn-Br, l = 2.54, 2.75 Å). The mutually trans Sn-S distances in each complex are shorter (2.52 Å) than the Sn-S distances trans to the halide [2.59 (bromide), 2.64 Å (iodide)]. For [Sn(S2COEt)2Br2], the ce..