SPECTROSCOPIC AND CONDUCTOMETRIC STUDIES OF ION-PAIR FORMATION OF THALLIUM (I) ACETATE IN NON-AQUEOUS SOLVENTS*

P. RIENVATANA

ABSTRACT: This paper presents evidence for the existence of two chemically distinct species of Thallium (I) in solutions of Thallium (I) acetate in acetonitrile, iso-proply alcohol and p-dioxane. These species are the solvated free Thallium (I) ion and ion-pairs of Thallium (I) ion with acetate and formate ions. Ultra-violet absorption spectra of the Thallium (I) salts show that the position of an absorption maximum due to ion-pair formation occurs at longer wavelengths than that due to the free solvated ion. The ion-pair band is sensitive to changes in the nature of solvent and concentration of added tetramethylammonium acetate, while that of the solvated free ion is not strongly solvent dependent. Electrical conductivities of Thallium (I) acetate in water, and binary mixtures with acetonitrile, iso-propyl alcohol, and p-dioxane, were also determined at 25^oC. The results show that Thallium (I) acetate behaves as a weak electrolyte existing largely as ion-pairs.

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Department of Chemistry, Chiang Mai University, Chiang Mai 50002, Thailand.

Received 6 July 1988