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Abstract pH and conductometric studies of the gallium chloride - mandelic acid - water system show the existence of three chelates in solution with a metal-to-ligand ratio of 1:1, 1:2 and 1:3. The solubility of freshly-precipitated gallium hydroxide in aqueous solutions of mandelic acid of varying concentrations, however, indicates the presence of only, 1:2- and 1:3-type species. These two complexes have here been isolated in the crystalline state. Their structures may be represented by (Remark: Graphics omitted.) and (Remark: Graphics omitted.) respectively. The 1:1 complex indicated by electrometric titrations appears to be fairly unstable, as it could neither be inferred from solubility experiments nor isolated in the crystalline state.
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Srivastava et al. (1965) studied this question.
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