Volume 2 • Issue 2 • 1000113 Curr Synthetic Sys Biol ISSN: 2332-0737 CSSB, an open access journal Research Article Open Access Faheim and Alaghaz, Curr Synthetic Sys Biol 2014, 2:2 DOI: 10.4172/2332-0737.1000113 Opinion Open Access Current Synthetic and Systems Biology Synthesis, Characterization, Biological Activity and Molecular Modeling Studies of Cu(II) Complex with N,O- Chelating Schiff’s Base Ligand Incorporating Azo and Sulfonamide Moieties Abeer A Faheim 1,2 and Abdel-Nasser M A Alaghaz 3,4 * 1 Chemistry Department, College of Education and Science (Khurma), Taif University, Al-Khurma, Taif, Saudi Arabia 2 Chemistry Department, Faculty of Science (Girl’s), Al-Azhar University, Cairo, Egypt 3 Chemistry Department, Faculty of Science (Boy’s), Al-Azhar University, Cairo, Egypt 4 Chemistry Department, Faculty of Science, Jazan University, Jazan, Saudi Arabia *Corresponding author: Abdel-Nasser M. A. Alaghaz, Faculty of Science Chemistry Department, Jazan University, Saudi Arabia, Tel: +073230029; E-mail: aalajhaz@hotmail.com Received May 15, 2014; Accepted June 26, 2014; Published July 09, 2014 Citation: Faheim AA, Alaghaz ANMA (2014) Synthesis, Characterization, Biological Activity and Molecular Modeling Studies of Cu(II) Complex with N,O- Chelating Schiff’s Base Ligand Incorporating Azo and Sulfonamide Moieties. Curr Synthetic Sys Biol 2: 113. doi: 10.4172/2332-0737.1000113 Copyright: © 2014 Faheim AA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abstract The copper(II) azo-dye Schiff base complex [CuL(OAc)]2, was prepared and characterized on the basis of el- emental analyses, spectral, magnetic, molar conductance and thermal analysis. Square-planar geometry has been assigned to the prepared complex. Dimeric complex is obtained with 2:2 molar ratio. The IR spectrum of the prepared complex was suggested that the Schiff base ligand (HL) behaves as a bi-dentate ligand through the azomethine nitrogen atom and phenolic oxygen atom. Thermal properties and decomposition kinetics of copper(II) complex was investigated. The interpretation mathematical analysis and evaluation of kinetic parameters (E,A, ΔH, ΔS and ΔG) of all thermal decomposition stages have been evaluated using Coats–Redfern (CR), Horowitz–Metzger (HM) and Piloyan–Novikova (PN) equations. In molecular modeling the geometries of ligand HL and its copper(II) complex was fully optimized with respect to the energy using the 6-31G basis set. The pathogenic activities of the synthesized com- pounds were tested in vitro against the sensitive organisms Staphylococcus aureus (RCMB010027), Staphylococ- cus epidermidis (RCMB010024) as Gram positive bacteria, Klebsiella pneumonia (RCMB 010093), Shigella Flexneri (RCMB 0100542), as Gram negative bacteria and Aspergillus fumigates (RCMB 02564), Aspergillus clavatus (RCMB 02593) and Candida albicans (RCMB05035) as fungus strain, and the results are discussed. Keywords: Azo-dye Schif’s base ligand; Copper complex; Electronic; IR; ESR; Molecular modeling Introduction Medical inorganic chemistry has exploited the unique properties of metal ions for the design of new drugs [1]. Sulfonamides were the frst drugs found to act selectively and could be used systematically as preventive and therapeutic agents against various diseases [2]. Sulfur ligands are wide spread among coordination compounds and are important components of biological transition metal complexes [3]. Research on Fe‒S complexes has fourished as a result of the discovery that they are present in electron transfer and nitrogen fxing enzymes [3]. Metal complexes with sulfur containing unsaturated ligands are also of a great interest in inorganic and organometallic chemistry, especially due to their potential with novel electrical and magnetic properties [3]. Schif bases continue to occupy an important position as ligands in metal coordination chemistry [4], even almost a century since their discovery. Schif bases have also been shown to exhibit abroad range of biological activities, including antifungal, antibacterial, antimalarial, antiinfammatory, anticancer and antiviral properties [5-10]. Te study of the reactivity of various types of hetero aromatic containing Schif bases linked to metal complexes has received a great deal of attention during the past decades [3]. Some transition metal(II)-complexes of biologically active Schif bases derived from condensation of 2-acetylfuran and 2-acetylthiophene with sulfaguanidine, sulphathiazole, sulphisoxazole and sulphadiazine in a 1:1 molar ratio using ethanol as the reaction medium were prepared [4]. Metal ion complexes of Schif bases derived from o-vaniline with sufanilamide and sulfamerazine were studied [11]. In continuation to our interest to prepare azo-dye Schif bases [12,13] the present paper aims chiefy to prepare azo-dye Schif base HL. Te behavior of this ligand toward copper (II) ion was studied. Te characterization of the prepared compounds was performed using diferent physicochemical methods. Newly synthesized ligand and its copper(II) complex have been screened against diferent bacterial and fungal growth. Te proposed structure for HL is shown in Figure 1. N C H O N N S H 2 N O O N C H O N N S H 2 N O O H H Enol-imine Keto-amine CH 3 CH 3 O H Figure 1: Keto–enol tautomerism. C u r r e n t S y n t h e t i c a n d S y s t e m s B i o l o g y ISSN: 2332-0737