Abstract
The first characterized amidinate complexes of Ge have been prepared using alkylamidinates as ancillary ligands. Spectroscopic and structural characterization of the two complexes, (CyNC(Me)NCy)2GeII (1) and (CyNC(tBu)NCy)2GeII (2) (Cy = cyclohexyl), revealed that the Ge coordination geometry is distorted tetrahedral in which one of the vertices is occupied by a lone pair of electrons. Both 1 and 2 exhibited one bidentate and one monodentate (“dangling”) ligand. Rapid oxidative addition of chalcogen atom sources (styrene sulfide and Se) to these complexes resulted in a series of rare terminal chalcogenido complexes with the formulas (CyNC(R)NCy)2GeCh [R = Me, Ch = S (3), Se(4); R = tBu, Ch = S (5), Se(6)]. The spectroscopic data and X-ray structure of 6 revealed a terminal GeSe complex. Mixed amidinato−amido analogues were similarly obtained. For example, [(CyNC(R)NCy)GeII[N(SiMe3)2] (R = Me, tBu) react to yield the corresponding terminal chalcogenido complexes. In the case of [(CyNC(Me)NCy)GeII[N(SiMe3)2...
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