IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736. Volume 5, Issue 4 (Sep. – Oct. 2013), PP 16-18 www.iosrjournals.org www.iosrjournals.org 16 | Page Studies On The Cobalt(II) And Copper(II) Complexes Of 2,5- Substituted 1,3,4-Triazoles C. Subha1, S. Sripriya2 And A. Selvaraj3., (1 Department of Chemistry, Nirmala College for Women, Coimbatore, India) ( 2,3 Department of Chemistry, CBM College, Coimbatore, India) Abstract: New metal complexes of Co(II),and Cu(II) have been synthesized by reacting metal solutions with the ligand 2,5-substituted 1,3,4-triazoles in alcoholic medium. Molecular formulae of the complexes were determined and are further characterized by IR spectroscopy, magnetic susceptibility and molar conductance studies. The ligand acts as a bidentate ligand co-ordinating through the nitrogen atoms present in the ring. Key Words: Complexes, Ligands, Transition metal complexes, Triazoles. I. Introduction: In co-ordination chemistry, a ligand is an ion or molecule that binds to a central metal atom to form a co-ordination complex. Ligands in a complex dictate the reactivity of the central atom, including ligand substitution rates and the reactivity of ligands themselves. Hence ligand selection is a critical consideration in many practical areas and has created a great interest in synthesis and characterization of co-ordination compounds. Triazoles belong to a group of heterocyles that have been reported to possess anti-inflammatory, analgesic, anti-microbial, anti-fungal [1] and many biological activities[2]. The wide range of application of the ligand and its metal complexes made us to prepare some of the new metal complexes. II. Experimental Methods All the reagents used are of analar grade. 2.1 Preparation of ligand: The synthesis of triazoles involves the synthesis of 1,3,4-oxadiazoles and their conversion into triazoles. The synthesis generally involves three stages. In the first stage semicarbazone was prepared from semicarbazide hydrochloride and sodium acetate crystals. 1-oxa-3,4-diazoles have been synthesized in the second stage by following the available literature[3]. N-substituted 1,3,4- triazoles were synthesized by refluxing oxadiazoles(from stage 2) in alcohol with the corresponding amino compound or ammonia for 1-2 hrs in the third stage. The reaction mixture was cooled in ice to get the 1-substituted triazoles. L 1 was prepared by using ammonia, L 2 was prepared by using hydrazine hydrochloride and L 3 was prepared by using hydroxylamine. The structure of the ligand is Ligands R 2 L1 H L2 -NH2 L3 -OH 2.2 Preparation of the complex: A solution of cobalt(II)chloride(5mmol) in ethanol(10ml) was added to a solution of triazoles(15mmol) in ethanol(40ml) and the mixture was boiled under reflux on a water bath for 3-4