Cu(II), Zn(II), Ni(II), Co(II) and Cd(II) form 1:2 (metal to ligand) complexes with salicylaldehyde-thiosemicarbazone. The accumulative stability constants of these complexes in aq-THF (1:1, vol./vol.) have been determine at different temps. (15, 20, 25, 30 and 35癈) and the thermodn. parameters, DG? DH? and DS?was evaluated. From these results, the stability order of the complexes and the complexing ability of the ligand have been discussed.

Key words: COBALT, ZINC, NICKEL, MANGANESE, COPPER, CADMIUM, POTENTIOMETRIC TITRATION, THIOSEMICARBAZONE P, SALICYLIC ACID P, COMPLEXATION