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A new ligand (H4L) and its complexes with (CoII, NiII, CuII and PdII). This ligand was prepared
in two steps, in the first step a solution of terephthaldehyde in methanol reacted under refluxe with
1,2-phenylenediamine to give precursore compound which reacted in the second step with 2,4-
dihydroxybenzaldehyde to give the ligand. The complexes were synthesized by direct reaction of
the corresponding metal chloride with the ligand. The ligand and complexes were characterized by
spectroscopic methods [FT-IR, UV-vis, 1HNMR, HPLC and atomic absorption], chloride contant in
addition to conductivity measurement. The stability constant K and Gibbs free energy ∆G were
calculated for [[Ni2(H2L)Cl2], [Cu2(H2L)Cl2] complexes using spectrophoto
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