Five-co-ordinate adducts of aluminium, gallium, indium, silicon, and germanium

Abstract

Vibrational spectra and analytical data are presented for the following compounds: MX₃,2NMe₃(where MX₃= AlCl₃, GaCl₃, InCl₃, InBr₃, Inl₃) and [M′Cl₃,2NMe₃]⁺ ClO₄^–(where M′= Ge, Si). For the Group III trihalides the qualitative order of (thermodynamic) stability appears to be Al > Ga < In, Cl > Br > I. Spectroscopic data are also presented for the supposed compound AlBr₃,2NMe₃. In all cases (except that of Inl₃,2NMe₃)D_3h symmetry is likely for the 5-co-ordinate neutral species.