Coordination compounds of quadridentate thiosemicarbazide: Their preparation, chracterization, structural investigation and thermal studies

New transition metal complexes of Co[II], Ni[II] and Cu[II] with oxalyl bis-thiosemicarbazide have been synthesized. Attempts have been made to ascertain their probable structures on the basis of elemental analysis, spectra [IR, electronic], thermal studies and magnetic measurements. The ligand can function as a tetra negative quadridentate [NSSN] with the metal ions forming a complexes in a molar ratio 1:1 having the empirical formula [ML and ML. 2H2O]. The magnetic moment measurements and the crystal field parameters calculated for Co[II] and Ni[II] complexes agree fairly well with that reported for Known octahedral complexes