Hydrates des halogenures de gallium. II Spectroscopie de vibration des complexes coordinés GaX3•H2O (X = Cl ou Br)

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Abstract
GaX3.H20 (X = Cl, Br) is a tetrahedrally coordinated adduct of gallium. From vibrational spectra of hydrates, deuteriates, and mixed crystals, bands assignments are made. Spectra are consistent with OGaX3 (C3υ) and H2O (C2υ) groups but the maximum symmetry of the whole complex (Cs) is lowered to C1 owing to the nonequivalence of the two O—H of the water molecule. The "Ga—O" stretching modes are located and the valence force field of OGaX3 skeleton is computed. The coordination bond is strong and the halogen–metal bonds are shorter than in the tetrahalogenogallate ions.

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