Synthesis, characterization and biological properties of binuclear complexes of CuII, NiII and CoII with 3,4-diphenyl-5-(2-hydroxyphenyl)-1,2,5-triazapenta- 2,4-diene (DHTP

School of Chemistry, Sambalpur University, Jyotivihar, Burla-768 019, Odisha, India E-mail : ashokpanda@yahoo.com P.G. Department of Chemistry, G. M. University, Sambalpur-768 004, Odisha, India Manuscript received online 21 June 2015, accepted 25 August 2015 The synthesis and characterization of a series of homo binuclear metal complexes of CuII, NiII and CoII with the titled ligand 3,4-diphenyl-5-(2´-hydroxyphenyl)-1,2,5-triazapenta-2,4-diene (DHTP) have been reported. The complexes have been synthesized by treating an ethanolic solution of the ligand with equimolar amount of appropriate metal salts in ethanol by a direct route and also by template synthesis using in situ method. The ligand and its metal complexes have been characterized on the basis of analytical and spectral data, thermal analysis, magnetic and conductivity measurements. Based on the results, tentative structures of the complexes have been proposed. The ligand as well as the metal complexes exhibit antimicrobial activities against the pathogenic fungus Aspergillus niger, Helminthosporium oryzae and Fusarium oxysporium. The fungicidal activities of the complexes have been compared with a standard fungicide Fluconazole