Preparation, properties, and structures of bis(O-ethyl dithiocarbonato)-dihalogenotin(IV) and di-µ-thio-bis[bis(O-ethyl dithiocarbonato)tin(IV)]
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 cell is monoclinic, space group C2/c, with a= 14.27(1), b= 16.894(8), c= 6.360(5)Å, β= 100.41 (5)°, Z= 4; R was 0.037 for 1 342 ‘observed’ reflections. For [Sn(S2COEt)2l2], the cell is monoclinic, space group P21/n, with a= 14.026(6), b= 11.210(4), c= 10.203(4)Å, β= 91.96(3)°; Z= 4, R being 0.030 for 2 512 ‘observed’ reflections.