THE COMPLEXES of N-salicylaldimine 2-urea (L 1) and N-salicylaldimine-2-thiourea (L2) with Fe(III), Co(II), Ni(II) and Cu(II) are formed in the molar ratios (1:1) as well as (1:2) (M:L) and characterized by elemental analysis, IR, electronic spectra, thermogravimetric analysis and magnetic measurements. The stoichiometry, proton-reagent stability constant, conditional formation constant of the complexes and the conductance are determined by using potentiometric and conductometric measurements. The study revealed that the ligands behave as monobasic bidentates, electronic spectra and magnetic measurements indicate that the metal chelates have octahedral or square-planar arrangements. Also, the TG analysis indicates the presence of hydrated and coordinated water molecules. The electrolytic and nonelectrolytic nature of the complexes were assigned based on molar conductance measurements.