Complexing behaviour of naphthylidene sulfamethazine schiff base ligand towards some metal ions

Mn [II], Co [II], Ni [II] and Cu [II] complexes of the Schiff base derived from 2-hydroxy-1-naphthaldehyde and sulfamethazine were prepared by both chemical and electrochemical methods. The structure of the complexes was investigated by chemical microanalysis, conductance and magnetic moment measurements as well as spectral methods. The results indicated that the Schiff base ligand behaved as tetradentate dibasic for 1:2 [L:M] complexes and bidentate monobasic for 1:1 and 2:1 [L:M] complexes. The thermal behavior of the complexes was studied using TGA and DTA. The energy of activation [Ea] for the decomposition process was calculated. The values of Ea of binuclear complexes were higher than those of the mononuclear complexes. For the 1:1 complexes, Ea increased as the ionic radii of metal ion increased