ISSN (Print): 2328-3777, ISSN (Online): 2328-3785, ISSN (CD-ROM): 2328-3793 American International Journal of Research in Formal, Applied & Natural Sciences AIJRFANS 15- 123; © 2015, AIJRFANS All Rights Reserved Page 26 Available online at http://www.iasir.net AIJRFANS is a refereed, indexed, peer-reviewed, multidisciplinary and open access journal published by International Association of Scientific Innovation and Research (IASIR), USA (An Association Unifying the Sciences, Engineering, and Applied Research) Potentiometric study of binary complexes of transition metal ions with β- diketone ligands Dr. S. R. Vaidya 1 , Dr. M. R. Bagal 2 , Dr. V. A. Shelke 3 , Dr. S. M. Jadhav 4 , Dr. T. K. Chondhekar 5 1,2 Department of Chemistry, Vivekanand Arts Sardar Dalipsing Commerce and Science College, Aurangabad, Maharashtra, INDIA 3 Department of Chemistry, Indraraj Arts, Commerce and Science College, Sillod, Dist. Aurangabad, Maharashtra, INDIA 4 Department of Chemistry, Siddharth Arts, Commerce and Science College, Jafrabad, Dist. Aurangabad, Maharashtra, INDIA 5 Dr. T. K. Chondhekar, Department of Chemistry, Dr. Babasahb Ambedkar Marathwada University, Aurangabad, Maharashtra, INDIA I. INTRODUCTION β-diketone ligands are used as ligands for almost 120 years. These derivatives were synthesized for the first time in 1887. The nature of bonding and chelation was elucidated by Werner and Morgan [1-2] . In the last decades, β- diketones and their metal complexes have been used as model compounds in physical chemistry studies. They have been also been used as chelating ligands for lanthanides and transition metals [3] .β-diketone and its metal complexes have been widely used in diverse areas because of their unique structural features, chemical functionalities, and toughness for light and heat as electroluminescence materials [4]. .β-diketones have gained a lot of interest due to their importance as good ligands [5] ,for the chelation with metals, as intermediate in the synthesis of core heterocycles such as flavones [6] ,pyrazole [7] .β-diketones have shown pharmacological activities like prophylactic antitumor [8] ,ntibacterial [9] and antioxidant [10] .They have also used as an antisunscreen agent [11] .β-diketones are well known to have keto-enol tautomerism and rescently it is reported that have the important pharmacophores for the HIV-integrase(1N) inhibitors [12] II. MATERIALS AND METHODS Experimental Micro analysis of the ligand is performed at the Central Drug Research Institute (CDRI). The H 1 NMR spectra of ligand were recorded on EM-360 spectrophotometer at RSIC, Punjab University, Chandigarh (India). IR spectra of ligand were recorded in KBr pellet on a FTIR-4100 Jasco in the region 4000-400 cm -1 . Reagents and chemicals The glass distilled water was collected in a Stoppard bottle and always used fresh. Its pH was about 6.60 to 6.80.THF: HPLC grade THF was freshly distilled and used. Commercial THF was purified by standard method described by Vogel[1]. All other chemicals like perchloric acid, sodium perchlorate and sodium hydroxide were of AR grade, obtained either from B.D.H. (London) or E. Merck, Reidal (Germany). The solutions of above reagents were prepared in CO 2 free glass distilled water by taking precautions to avoid errors in their concentrations. Exact normalities were obtained by standard methods. Instruments: An Elico model LI - 120 digital pH meter in conjuction with an Elico combined electrode consisting of glass and reference electrodes in a single entity of the type CL - 51 was used for the pH measurements. Synthesis and characterization of β – Diketones The method used for synthesis of diketones involves two steps Abstract:A new β-Diketone ligands are synthesized from 2-hydroxy acetophenone and 3,4,4-triethoxy benzoic acid and characterized by elemental analysis, conductometry, UV-visible, IR spectra, 1 H-NMR and 13 C-NMR. The stability constants of β-diketone ligand complexes with transition metal ions Co(II), Ni(II), Cu(II), Zn(II) and Mn(II) were determined pH metrically. The stability constants of β-diketone ligands and metals have been calculated. Keywords: β-diketone ligands, binary complexes, transition metals.