The formation of proton-mixed ligand complexes (amine-carboxylic ligand) has been studied potentiometrically, using a (H+)-glass electrode, in aqueous solution, at T = 25-degrees-C. Least squares calculations showed that mixed species of the general formula H(r)A(am) are formed, in which r = 1,2...(m+n-1); m and n are the maximum degree of protonation for carboxylate A and amine am, respectively. For the proton-ethylamine-citrate system, the complex H(r)(cit)(etam)2 (r = 2,3) were also found. The stability of these complexes is discussed as a function of basicity, steric characteristics and charges of the ligands.
STUDIES ON LIGAND-LIGAND INTERACTION - FORMATION AND STABILITY OF ETHYLAMINE, ETHYLENEDIAMINE, 1,2-DIAMINOPROPANE, AND DIETHYLENE-TRIAMINE COMPLEXES WITH ACETIC, OXALIC, MALONIC, SUCCINIC AND CITRIC ACIDS, IN AQUEOUS-SOLUTIONS
DANIELE, Pier Giuseppe;GASTALDI, Daniela;
1992-01-01
Abstract
The formation of proton-mixed ligand complexes (amine-carboxylic ligand) has been studied potentiometrically, using a (H+)-glass electrode, in aqueous solution, at T = 25-degrees-C. Least squares calculations showed that mixed species of the general formula H(r)A(am) are formed, in which r = 1,2...(m+n-1); m and n are the maximum degree of protonation for carboxylate A and amine am, respectively. For the proton-ethylamine-citrate system, the complex H(r)(cit)(etam)2 (r = 2,3) were also found. The stability of these complexes is discussed as a function of basicity, steric characteristics and charges of the ligands.
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