Abstract

The consecutive and gross stability constants of a number of mononuclear uranyl complexes with anions of common carboxylic acids have been determined spectrophotometrically at an ionic strength of 1·0 in aqueous solutions. Great care was exercised to avoid uncontrolled hydrolytic action on the complexes by the solvent. The data show that the maximum ligand number for anions of normal fatty acids increase in parallel with the length of the carbon chain. Further general relations appear between the stability of the uranyl complex and the dissociation constant of the carboxylic acid corresponding to the respective ligand anion. The results for oxalate and lactate furnish experimental proof for the fact that the maximum co-ordination number of the uranyl ion equals 6.

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