Diaminogermylene and Diaminostannylene Derivatives of Gold(I): Novel AuM and AuM<sub>2</sub> (M = Ge, Sn) Complexes
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The reactions of [AuCl(THT)] (THT = tetrahydrothiophene) with 1 equiv of the group 14 diaminometalenes M(HMDS)2 [M = Ge, Sn; HMDS = N(SiMe3)2] lead to [Au{MCl(HMDS)2}(THT)] [M = Ge (1), Sn (2)], which contain a metalate(II) ligand that arises from insertion of the corresponding M(HMDS)2 reagent into the Au–Cl bond of the gold(I) reagent. While compound 1 reacts with more Ge(HMDS)2 to give the germanate–germylene derivative [Au{GeCl(HMDS)2}{Ge(HMDS)2}] (3), which results from substitution of Ge(HMDS)2 for the THT ligand of 1, an analogous treatment of compound 2 with Sn(HMDS)2 gives the stannate–stannylene derivative [Au{SnCl(HMDS)2}{Sn(HMDS)2(THT)}] (4), which has a THT ligand attached to the stannylene tin atom and which, in solution at room temperature, participates in a dynamic process that makes its two Sn(HMDS)2 fragments equivalent (on the NMR time scale). A similar dynamic process has not been observed for the AuGe2 compound 3 or for the AuSn2 derivatives [Au{SnR(HMDS)2}{Sn(HMDS)2(THT)}] [R = Bu (5), HMDS (6)], which have been prepared by treating complex 4 with LiR. The structures of compounds 1 and 3–6 have been determined by X-ray diffraction.
