Reaction of 1, 2-diaminoethane with 3-(2-thiazolylazo)-2,4-pentanedione yielded polydentate Schiff base ligand. The existence of this ligand in intra-molecularly bonded keto-imine form has been established with its analytical I.R., 'H&NMR data. Dibasic tetradentate coordination of the ligand with metals (Ti+3, Mn+3, V+3, Co+3, Fe+3, MoO(v), Ru+3¸Ru+2, & MoO2(VI) has been established on the basis of analytical, conductometric, magnetic & spectral data