The formation constants of [Ca(ala)]+ and [Ca(ala)H]2+ (ala = α-alaninate) complexes have been determined potentiometrically at several temperatures (10 ⩽ T ⩽ 50 ° C) and ionic strengths (0.04 ⩽ I ⩽ 1 mol 1−1). Since tetraethylammonium (Et4N+) and sodium salts have been used as reference backgrounds, the interactions of these salts with α-alaninate have been also studied. The following very unstable species have been found: [Na(ala)]0, [Na(ala)]H+, [Et4N(ala)]0, [(ala)HCl]− and [(ala)H2Cl]0. ΔHo values for the formation of all these species were obtained from the dependence on temperature of the formation constants.
Thermodynamic Parameters for the Formation of Calcium -alaninate Complexes in Aqueous Solution
CASALE, Agatino;DE ROBERTIS, Alessandro;DE STEFANO, Concetta;
1989-01-01
Abstract
The formation constants of [Ca(ala)]+ and [Ca(ala)H]2+ (ala = α-alaninate) complexes have been determined potentiometrically at several temperatures (10 ⩽ T ⩽ 50 ° C) and ionic strengths (0.04 ⩽ I ⩽ 1 mol 1−1). Since tetraethylammonium (Et4N+) and sodium salts have been used as reference backgrounds, the interactions of these salts with α-alaninate have been also studied. The following very unstable species have been found: [Na(ala)]0, [Na(ala)]H+, [Et4N(ala)]0, [(ala)HCl]− and [(ala)H2Cl]0. ΔHo values for the formation of all these species were obtained from the dependence on temperature of the formation constants.File in questo prodotto:
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