Abstract
Abstract Aspartate and glutamate have been studied as ligands (L) towards zinc(II) at 25°C and in 1.00 M NaC104 by measuring the electromotive force of galvanic cells containing glass and zinc amalgam electrodes over a wide concentration range of reagents. The experimental data were explained by assuming the formation of mononuclear species of the type ZnHpLr where p ≥ 0 and r ≥ 1. For aspartate, evidence for the complexes ZnL, ZnHL, ZnH2L, ZnL2, ZnHL2, ZnH2L2, ZnL3, ZnHL3 and ZnH2L3 was found, whereas for glutamate, the complexes ZnL, ZnHL, ZnL2, ZnHL2, ZnL3, ZnHL3, ZnH2L3 were found. Evidence for the species ZnH2L was found also in the case of glutamate. The relative stability constants have been determined and compared with those of other ligands and cations.
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