Log Ki, ΔH°i, and ΔS°i values for the interaction of glycinate ion with H+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, and Cd2+ at 10, 25, and 40°

Abstract

Values of log K_i, ΔH°_i, and ΔS°_i valid at zero ionic strength in aqueous solution are reported for the reaction MG_i^{2 –i}+ G^–= MG_{i+ 1}^{1 –i} where G = glycine and M = Mn(i= 0), Fe(i= 0), Co(i= 0,1,2), Ni(i= 0,1,2), Cu(i= 0,1), Zn(i= 0,1,2), and Cd(i= 0,1,2) at 10,25, and 40°. The ΔC°_pi, values calculated from the temperature dependence of ΔH°_i indicate that solvent effects for the various metal complexes are similar. Values of pK, ΔH°, and ΔS° valid at zero ionic strength are determined or summarized from the literature for proton ionization from glycine at 10, 25, and 40° and a value of ΔC°_p is calculated from the temperature variation of the ΔH° values.