196880-20-3Relevant academic research and scientific papers
Facile formation of rare terminal chalcogenido germanium complexes with alkylamidinates as supporting ligands
Foley, Stephen R.,Bensimon, Corinne,Richeson, Darrin S.
, p. 10359 - 10363 (2007/10/03)
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)2Ge(II) (1) and (CyNC((t)Bu)NCy)2Ge(II) (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)2Ge=Ch [R = Me, Ch = S (3), Se(4); R = (t)Bu, Ch = S (5), Se(6)]. The spectroscopic data and X-ray structure of G revealed a terminal Ge=Se complex. Mixed amidinato-amido analogues were similarly obtained. For example, [(CyNC(R)NCy)Ge(II)[N(SiMe3)2] (R = Me, (t)Bu) react to yield the corresponding terminal chalcogenido complexes. In the case of [(CyNC(Me)NCy)Ge(II)[N(SiMe3)2]Se (10), a crystallographic study confirmed the presence of a terminal Ge=Se bond.
