Formation and Reactivity of heavy Group 14-15 bonds

A series of low-valent Group 14-15 compounds were obtained starting from [(Dipp2NacNac)MCl] (M=Ge-Pb) (I-III) (Dipp2NacNac=HC{C(Me)N(Dipp)}2) and M'E(SiMe3)2 (M'=Li, E=As; M'=K, E=Sb, Bi) (IV-VI). In the course of this investigations we were able to fully characterize all permutations except Pb-Bi for compounds of the composition [(Dipp2NacNac)ME(SiMe3)2] (1E: M=Ge, 2E: M=Sn, 3E: M=Pb). Thus, we report the first low valent tetrelene with Sn-Bi bond. All isolated compounds, were examined by NMR spectroscopy, IR spectroscopy and except compound 1As by X-ray structure analysis. Moreover, were examined UV-Vis spectroscopy and investigated the reactivity of these compounds towards different substrates in more detail. Starting with the compound [(Dipp2NacNac)SnAs(SiMe3)2] (2As), the reaction with red selenium yields [(Dipp2NacNac)Sn-Se-As(SiMe3)2] (4) which exhibits a Sn-Se-As chain. Heavy group 14-15 compounds: Various low-valent group 14-15 compounds of the type [(Dipp2NacNac)ME(SiMe3)2] (M=Ge-Pb, E=As-Bi) were obtained by salt elimination reactions. The focus of these investigations is on the heavy representatives of both groups, on the structures and the reactivity. image