Chemistry of (tetramethylcyclopentadienyl)gallium(III) compounds

Two tetramethylcyclopentadienyl gallium(III) compounds Ga(C5Me4H)(3) and Cl -2(C5Me4H)Ga . pyridine have been prepared and characterized. In contrast, when the syntheses of Ga(C5Me4H)(2)Cl, Ga(C5Me4H)Cl-2 and Me2Ga(C5Me4H) wer e attempted by metathetical and/or ligand redistribution reactions, the iso lated product in each case was a mixture of chemically related compounds ra ther than single species. When pyridine was added to a solution prepared by combining Ga(C5Me4H)(3) and GaCl3 in a 1:2 mol ratio in diethyl ether, the product was the adduct Cl-2(C5Me4H)Ga . pyridine, a yellow-green crystalli ne solid. An elemental analysis, H-1- and C-13-NMR spectra and an X-ray str uctural study confirmed the identity of this gallium-nitrogen adduct. (C) 2 001 Elsevier Science B.V. All rights reserved.