Tris(amido)tingold Complexes in Different Oxidation States. First Structural Characterization of a Sn−Au−Au−Sn Linear Chain

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Abstract
The reaction of [MeSi{Me2SiN(Li)(p-tol)}3(Et2O)2] with SnCl2 in a 1:1 molar ratio leads the tris(amido)stannate [MeSi{Me2SiN(p-tol)}3SnLi(Et2O)] (1), which further reacts with neutral [AuCl(PPh3)] and anionic [PPN][AuCl2], PPN[AuRCl] (R = C6F5, mes), and chlorogold(I) complexes yielding [Au(MeSi{Me2SiN(p-tol)}3Sn)(PPh3)] (2) and [PPN][Au(MeSi{Me2SiN(p-tol)}3Sn)2] (3) and [Au(MeSi{Me2SiN(p-tol)}3Sn)(R)] (R = C6F5, 4; R = mes, 5), respectively. The reaction of 1 with the dinuclear gold(II) derivative [Au2(CH2PPh2CH2)2Cl2] in a 1:2 ratio affords [Au2(CH2PPh2CH2)2(MeSi{Me2SiN(p-tol)}3Sn)2] (6) . In a similar way but starting from PPN[Au(C6F5)3Cl] and reacting with 1 in a 1:1 ratio, the Au(III) complex [PPN][Au(MeSi{Me2SiN(p-tol)}3Sn)(C6F5)3] (7) has been obtained. X-ray crystal structure analyses were performed for compounds 2 and 6, establishing the Sn−Au bonds [d(Au−Sn) = 2.5651(13) and 2.6804(13) Å, respectively). Compound 6 has a nearly linear Sn−Au-Au−Sn array and features the first examples of tin−gold(II) bonds.