Dimethyl-Gallium/-Indium Complexes Derived from Bis(2-Hydroxy Benzylidene)-1,4-Phenylenediamine and Bis(2-Hydroxybenzylidene)-4,4’-Methylene Dianiline: Synthesis and Structural Characterization

Reactions of trimethyl-gallium/-indium etherate with bis(2-hydroxybenzylidene)-1,4-phenylenediamine and bis(2-hydroxybenzylidene)-4,4’-methylene dianiline in benzene at room temperature afford complexes of compositions [1,4-{Me2MOC6H4CH=N}2-C6H4] (M=Ga (1), In (2)) and [{Me2MOC6H4CH=NC6H4}2-CH2] (M=Ga (3), In (4)), respectively. These complexes were characterized by elemental analysis, IR and NMR (1H, 13C) spectroscopy. The complexes [1,4-{Me2GaOC6H4CH=N}2-C6H4] (1) and [{Me2GaOC6H4CH=NC6H4}2-CH2]·[Me2Ga(μ-OH)]3.C6H6 (5b) (formed by partial hydrolysis during crystallization) have been structurally characterized. The gallium atom in these complexes adopts a distorted tetrahedral configuration. The fragment [Me2Ga(μ-OH)]3 in 5b acquires a trimeric structure rather than the tetrameric form as described earlier.