Abstract: | Some new unsymmetrical tetradentate Schiff-base ligands, (N-salicylidene-N′-pyrrolidene)-1,2-ethylenediamine(H2salpyren) (H2L1), (H2Mesalpyren) (H2L2), (H2phsalpyren) (H2L3), (N-salicylidene-N′-pyrrolidene)-1,3-propylenediamine (H2salpyrpd) (H2L4), (H2Mesalpyrpd) (H2L5), (H2phsalpyrpd) (H2L6) and their Ni(II) and Cu(II) complexes were synthesized and characterized by elemental analyses, IR, UV-Vis, 1H NMR and mass spectra and magnetic moments. Possible structures of these complexes have been proposed. The thermodynamic formation constants of the complexes were determined spectrophotometrically at constant ionic strength 0.1?M (NaClO4), at 25°C in methanol. |