| Summary: | Three oxygen donor gallium(III) halide complexes, [GaX<sub>3</sub>(O=P(TMP)<sub>3</sub>] (TMP = trimethoxylphenyl and X = Cl<sup>−</sup> (<b>1</b>), Br<sup>−</sup> (<b>2</b>) and I<sup>−</sup> (<b>3</b>)), are prepared by oxidation in mixed solvents from their phosphine adducts of [GaX<sub>3</sub>(P(TMP)<sub>3</sub>]. Three crystalline compounds are obtained from the solutions and their crystal structures are determined in the solid state. It is rare to generate a crystalline phase for metal–adduct compounds of this bulky ligand; in this paper, three new crystal structures are presented.
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