Synthesis, Characterization and SEM Analysis of 5-methyl-4-[(E)-(phenylmethylidene) amino]-4H-1,2,4-triazole-3-thiol and its Metal Complexes with Cd (II) and Hg (II)

The Schiff base containing triazole moiety and their derived metal complexes are widely studied due to their structural features and biological activities. In present work, the aldimine ligating molecule, 5-methyl-4-[(E)-(phenylmethylidene) amino]-4H-1,2,4-triazole-3-thiol (HL) and their complexes with bivalent cadmium and mercury ions have been synthesized. The structure of the compounds has been elucidated by conductivity data, microanalytical analysis and spectral techniques. The composition of complex is found to be [M(L)2] where M= Cd (II) & Hg (II) and L= deprotonated ligand. The proton NMR and vibrational spectra of the compounds indicates that HL is bidentate and metal binds to ligand utilizing aldimine N-atom and deprotonated sulfhydryl (SH) group. The surface morphology, grain size and texture of compounds as well as evidence of complex formation have been obtained by Scanning Electron Microscopy (SEM) analysis. The surface morphology of ligand is smooth and homogeneous with cuboidal grains while complexes have heterogeneous rough morphology. The grains in complexes are agglomerated. The compounds prepared are microcrystalline.