205TL-NMR and UV-Visible spectroscopic determination of the formation constants of aqueous thallium(I) hydroxo-complexes

Sipos, P., Capewell, S.G., May, P.M., Hefter, G., Laurenczy, G., Lukács, F. and Roulet, R. (1997) 205TL-NMR and UV-Visible spectroscopic determination of the formation constants of aqueous thallium(I) hydroxo-complexes. Journal of Solution Chemistry, 26 (5). pp. 419-431.

Abstract

The hydrolysis of Tl(I) has been studied at 25°C using 205Tl-NMR spectroscopy and UV-Vis spectrophotometry in aqueous solutions with ionic strengths maintained by NaClO4 at 2, 4, 6, and 8M. The formation constant and the spectral characteristics for the hydroxo complex, TlOH° have been determined. At high hydroxide ion concentrations there is clear evidence from the UV-Vis data for the formation of a Tl(OH)2- species. The spectrum and an estimated formation constant for this second hydroxo complex are also reported.