New metal complexes derived from schiff base ligand resulted from condensation of o. Vanillin and o. amino phenol. The ligand characterize by 1HNMR, 13C NMR mass and IR. The ligand acts as tridentate coordinating with Cu(II), Co(II) and Cd(II) Via azomethine nitrogen and two enolic hydroxyl oxygen after displacement of hydrogen. The thermodynamic parameters ΔE, ΔH, ΔS and ΔG have been calculated from Tg data by Coat- Redfern method.