Table of Contents
ISRN Analytical Chemistry
Volume 2014, Article ID 243175, 5 pages
Research Article

Complex Formation of Nickel(II) and Copper(II) with Barbituric Acid

Department of Chemistry, Faculty of Arts and Sciences, Uludağ University, 16059 Bursa, Turkey

Received 17 December 2013; Accepted 6 January 2014; Published 12 February 2014

Academic Editors: Z. Aydogmus and I. Zhukov

Copyright © 2014 Naciye Türkel and M. Suat Aksoy. 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.


Equilibrium studies have been carried out on complex formation of M2+ ions (M = Ni and Cu) with L = barbituric acid (BA) in aqueous solution at °C and with an ionic strength of  M (KNO3) in aqueous medium. The basicity of the ligand was also assessed by the determination of the dissociation constants of the ligand. The experimental pH titration data were analyzed with the help of the BEST computer program in order to evaluate the stability constants of the various species formed. The stability constants of the binary systems decrease in the order of Cu(II) > Ni(II). Distribution diagrams for the species were drawn showing the concentrations of individual species as a function of pH by the SPE software program.