Sir: Studies on tetraphenylstibonium salts (2-4) reveal solubility behavior which indicates possible usefulness of these compounds as reagents for inorganic analysis, particularly for the determination of fluoride. The starting material for the preparation of the salts was tetraphenylstibonium hydroxide (4), a compound which precipitates when ammonium hydroxide is added to a saturated aqueous tetraphenylstibonium bromide (1, 6) solution. Most of the salts were readily obtained from the hydroxide by treating it with the appropriate acids. The less soluble salts were also prepared by precipitation from a concentrated tetraphenylstibonium sulfate solution. Composition of the compounds listed in Table I was established by chemical analysis (2, 4)• Solubilities were determined by shaking the compounds with pure solvent at constant temperature until saturation was achieved (2, 4).

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