Abstract
Homoleptic gallium tris(alkoxides) [Ga(OR)3]2 were prepared by the reaction of [Ga(NMe2)3]2 (1) and excess ROH (R = CH2CH2NMe2 (2), CH(CH3)CH2NMe2 (3), C(CH3)2CH2OMe (4), CH2CH2OMe (5)) in toluene at room temperature. Compounds 2–5 were isolated as colourless oils. The side-products, [Ga(OCH2CH2NMe2)2Cl] (6), [Ga(OCH(CH3)CH2NMe2)2Cl] (7) and [Ga(OC(CH3)2CH2OMe)Cl2]2 (8) were also isolated in low yield during the synthesis of 2, 3 and 4, respectively. However, compounds 6 and 7 were also prepared directly from the reaction of [Ga(NMe2)2Cl] and 2 equivalents of ROH (6, R = CH2CH2NMe2; 7, R = CH(CH3)CH2NMe2). Similarly, compound 8 was isolated from the reaction of [Ga(NMe2)Cl2] and 1 equivalent of HOC(CH3)2CH2OMe. Single crystal X-ray crystallography showed that the gallium bis(alkoxides) (6 and 7) are monomeric in the solid state with the gallium centre adopting a distorted trigonal bipyramidal geometry. In contrast, the gallium mono(alkoxide) 8 is dimeric.
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