SYNTHESIS AND CHARACTERIZATION OF 4- AMINO-3-MERCAPTO-5-METHYL-1, 2, 4 -TRIAZOLE AND ITS MIXED- LIGANDS COMPLEX WITH Cd (II) IONS

Abstract

In the present investigation, the Schiff base (E)-4-(2-hydroxynaphthalen-1-yl) methylene) amino)-5-methyl-2,4-dihydro-3H-1,2,4-triazole-3-thione was prepared by the condensation reaction of 2-hydroxyl-1-naphthaldehyde with  4-amino-3-mercapto-5-methyl-1, 2, 4-triazole. The synthesized Schiff base (ligand, L₁) was used to prepare complex with cadmium (II) ion (Cd(II)) by the reaction of  cadmium (II) chloride (CdCl₂) and the ligand under reflux. Mixed-ligands complex was prepared by treating the metal complex with Schiff base in solution with thiophene (the secondary ligand, L₂) in solution. The solid complex obtained with the secondary ligand was purified, dried and characterized on the basis of melting point, micro-analytical data, spectroscopic data (Fourier Transform Infrared, Uv-visible, ¹H-NMR, powder X-ray diffraction).The assignment and the nature of the electronic transitions observed in the Uv-visible spectra were analysed using the multiwfn analyzer.