Viscosity of ternary mixtures. IV. Urea – tert-butyl alcohol – water at 25 °C

Abstract

. Can. J. Chem. 59. 3248(1981). We have measured, at 25"C, the viscosities of urea and tert-butyl alcohol ternary aqueous solutions for total concentrations reaching about 4 M and various ratios of the solutes. We have also determined B coefficients of the Jones-Dole law for urea in water-tert-butyl alcohol mixtures and for tert-butyl alcohol in water-urea mixtures. The results can be fitted in the form: where q, is the viscosity relative to water and subscripts 1 and 2 characterise the two solutes. B, and B, are determined in water and the additional D parameters appear as pair-interaction contributions of the solutes to the viscosity of the system. Some relations are established and verified between the previous parameters and the B coefficients of I and 2 determined, respectively, in the aqueous mixtures of 2 and I .

Effect of urea on speciation of cobalt(II) complexes of L-glutamine and succinic acid

“…Urea is a non-electrolyte and hydrophilic water structure breaker (Whitney and Tanford, 1962;Levine et al, 1963;Palma and Morel, 1981), physiologically important compound and has a wide range of bioinorganic (Wages et al, 1993;Koga et al, 1998) and pharmaceutical (Stetsenko et al, 1978;Theophanides and Harvey, 1987) applications. Pt -urea complexes have antitumor activity (Stetsenko et al, 1978).…”