AbstractSalicylidene‐o‐aminobenzothiol and its 5‐chloro and 5‐bromo derivatives, dibasic tridentate Schiff bases, dervied from the condensation ofo‐aminothiol and Salicylaldehyde, 5‐chloro salicylaldehyde and 5‐bromo salicylaldehyde, were used for coordination with Zr(IV), Th(IV) and UO2(VI) metal inos. The I:I (metal‐ligand) stoichiometry of these complexes is shown by elemental analysis and conductometric titrations. Molecular structure of these complexes are proved by Infra‐red spectroscopy and thermogravimetric analysis. Magnetic susceptibility measurements of Zr(IV), Th(IV) and UO2(VI) complexes show their diamagnetic and octahedral geometry. Results show that all the complexes have solvent molecules in coordinati