Table of Contents
International Journal of Inorganic Chemistry
Volume 2012 (2012), Article ID 791219, 11 pages
http://dx.doi.org/10.1155/2012/791219
Research Article

Polydentate Schiff Base Ligands and Their La(III) Complexes: Synthesis, Characterization, Antibacterial, Thermal, and Electrochemical Properties

1Chemistry Department, Osmaniye Korkut Ata University, 80100 Osmaniye, Turkey
2Chemistry Department, K.Maras Sütcü Imam University, 46100 K.Maras, Turkey
3Biology Department, K.Maras Sütcü Imam University, 46100 K.Maras, Turkey

Received 3 November 2011; Revised 27 December 2011; Accepted 14 January 2012

Academic Editor: Maurizio Peruzzini

Copyright © 2012 Ali E. Şabik et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We synthesized the Schiff base ligands H2L1–H2L4 and their La(III) complexes and characterized them by the analytical and spectroscopic methods. We investigated their electrochemical and antimicrobial activity properties. The electrochemical properties of the ligands H2L1–H2L4 and their La(III) complexes were studied at the different scan rates (100 and 200 mV), different pH ranges ( p H = 2 1 2 ), and in the different solvents. The electrooxidation of the Schiff base ligands involves a reversible transfer of two electrons and two protons in solutions of pH up to 5.5, in agreement with the one-step two-electron mechanism. In solutions of pH higher than 5.5, the process of electrooxidation reaction of the Schiff base ligands and their La(III) complexes follows an ECi mechanism. The antimicrobial activities of the ligands and their complexes were studied. The thermal properties of the metal complexes were studied under nitrogen atmosphere in the range of temperature 20–1000°C.