Abstract

A series of new mixed ligand complexes of cobalt(II), nickel(II), copper(II) and cadmium(II) have been synthesized with 3benzyl1H4[(2 methoxybenzylidine) amino]1, 2, 4triazole5 thione (MBT), 3bezyl1H4[(4chlorobenzylidine) amino]1, 2, 4triazole5thione (CBT), 3benzyl 1H4[(4nitrobenzylidine)amino]1, 2, 4triazole 5thione (NBT) and dehydroacetic acid sodium salt (Nadha). The mixed ligand complexes have been characterized by elemental analysis, spec troscopic spectral measurements (IR, UVVis.), molar conductance, magnetic measurements and thermal studies. The stoichiometry of these com plexes is M:L1:L2 = 1:1:1, 1:2:1 or 1:1:2 where L1 = NBT, CBT and MBT and L2 = Nadha. Tetrahedral structure was proposed for all Cd(II) mixed ligand complexes while the square planar geometry was proposed for Cu(II) mixed ligand complex with NBT. Octahedral structure was proposed for Ni(II), Co(II) mixed ligand complexes and Cu(II) mixed ligand complexes with CBT and MBT ligands. The thermal decomposition study of the prepared complexes was monitored by TG, DTG and DTA analysis in dynamic nitrogen atmosphere. TG, DTG and DTA studies confirmed the chemical formulations of theses complexes. The kinetic parameters were determined from the the thermal decomposition data using the graphical methods of CoatsRedfern and HorwitzMetzger. Thermodynamic parameters were calculated using standard relations.

Highlights

  • A series of new mixed ligand complexes of cobalt(II), nickel(II), copper(II) and cadmium(II) have been synthesized with 3-benzyl-1H-4-[(2methoxybenzylidine) amino]-1, 2, 4-triazole-5thione (MBT), 3-bezyl-1H-4-[(4-chlorobenzylidine) amino]-1, 2, 4-triazole-5-thione (CBT), 3-benzyl1H-4-[(4-nitrobenzylidine)amino]-1, 2, 4-triazole5-thione (NBT) and dehydroacetic acid sodium salt (Nadha)

  • The importance of similar pyrones as potential fungicides is reinforced by the existence of several natural fungicides possessing structures analogous to 5, 6-dihydro dehydroacetic acid, like alternaric acid, the podoblastins and lachnelluloic acid [3,4,5], studies have shown that such compounds and their complexes have very interesting biological properties[6,7,8,9,10,11,12,13]

  • The work of the present paper is devoted to the synthesis and characterization of some new mixed ligand complexes containing mercaptotriazoles and dehydroacetic acid

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Summary

INTRODUCTION

3-acetyl-6-methyl-2H-pyran-2, 4(3H)-dione, a commercially available compound usually obtained through the auto condensation of ethyl acetoacetate [1], it has been shown to posses modest antifungal properties [2]. Mercaptotriazoles and their complexes have been shown to posses enhanced biological activities [14,15,16,17,18,19,20,21,22,23,24,25,26,27]. The work of the present paper is devoted to the synthesis and characterization of some new mixed ligand complexes containing mercaptotriazoles and dehydroacetic acid. The present paper reports the thermal analysis studies of some mixed ligand complexes.

Materials and Measurements
Synthesis of the Mercaptotriazole Ligands
Physical Measurements
Elemental Analyses and Conductivity Measurements
UV-Visible Spectra and Magnetic Susceptibility Measurements
IR Spectra
Thermal Decomposition Studies
Thermal Stability
Conclusions
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