Thermodynamic considerations in co-ordination. Part XV. Potentiometric and calorimetric study of the complexes formed between protons, first transition series metal ions, and asparaginate and glutaminate anions

Abstract

ΔG°, ΔH°, and ΔS° for the asparaginate –H⁺, Mn^II, Fe^II, Co^II, Ni^II, and Zn^II, and for the glutaminate –H⁺, Ni^II, and Cu^II systems are reported for aqueous solution studies at 25 °C and I= 3·00M(Na⁺) ClO₄^–. The results are used to calculate that quite a large proportion of asparaginate in blood plasma may be complexed to Zn^II, Fe^II, and Co^II, as well as to the expected Cu^II.