Conductometric studies of the thermodynamics compelexation of Ag+, Co2+, Hg2+, Zn2+, Ni2+, Cu2+, Cd2+, Mg2+, Cr3+, Fe3+ and Pb2+ iones with new shift base ligand derivatives in acetonitrile solution

The complex-formation reactions between of Ag+, Co2+, Hg2+, Zn2+, Ni2+, Cu2+, Cd2+, Mg2+, Cr3+, Fe3+ and Pb2+ iones with (N,N -bis (2-hydroxybnzylydn) hydrazine-1 carbothiohydrazid) (scheme 1) has been studied by conductometric methods in acetonitrile at various temperatures.Formtion constants of the 1:1 and 1:2 complexes (metal ion to ligand) were calculated from the computer fitting of the absorbance-mole ratio data and molar4 conductance-mole ratio data at different temperatures.the enthalpy and entropy changes of the complexation reaction were determined from the temperature dependence of the formation constants. Scheme 1. (N,N -bis (2-hydroxybnzylydn) hydrazine-1 carbothiohydrazid)