X-ray structural analysis of Me_3M centre dot HN(CH_2Ph)_2 (M = Ga, In) adducts

摘要

The molecular structures of Me_3Ga centre dot HN(CH_2Ph)_2 (2) and Me_3In centre dot HN(CH_2Ph)_2 (3) have been determined by single-crystal X-ray diffraction methods. The structures of these molecules are representative of datively bonded Lewis acid/base adducts, having Ga-N and In -N bond distances of 2.151(3) and 2.382(5) A, respectively. A comparison with the structure of the corresponding Al adduct, Me_3Al centre dot HN(CH_2Ph)_2 (1), reveals that all three derivatives are isostructural, crystallizing in the same space group, Pl. The crystal structure data for these adducts are compared to experimental structural data and geometries from theoretical calculations for adducts of the type R_3M centre dot amine, where R = H, Me; M = Al, Ga, In.