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Conductance Studies on Complex Formation between CaCl2 and Ampicillin as Ligand in Water and In Methanol Solvent at Different Temperatures

Esam A Gomaa, Elsayed M Abou Elleef and ET Helmy

The complexation reactions between the metal cation (Ca2+) and ligand (ampicillin) was studied in water and in pure MeOH solvent at 293.15, 298.15, 303.15 and 308.15K by applying the conductometric method. Consequently, we will study the effect of solvent properties on stoichiometry, the selectivity between ligand and ions in various systems and thermodynamic parameters of complexation. On drawing the relation between molar conductance and the ratio of metal to ligand concentrations, different lines are obtained indicating the formation of 1:1, and 2:1 (M:L) stoichiometric complexes. The stability constant of the complexes were obtained from fitting the molar conductivity curves using a computer program. This research focused on the study of thermodynamic complexation reactions between the ligand, ampicillin, with Ca2+ metal cation in water and pure MeOH solvent.