Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 144, Issue 1-2, Pages 97-101Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2008.10.012
Keywords
Pyrimidines; Conductometry in acetonitrile; Thermodynamic parameters
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The complexation reactions between Cr3+ Cd2+, Co2+, Ni2+, Hg2+, Zn2+, Pb2+,and Ag+ metal ions with diethyl-3-(4-hydroxy-6-methylpyrimidin-2-yl) guanidine (L1), 2-amino,4-hydroxy,6-methylpyrimidine (1.2), and 2-(diethylamin),4-hydroxy,6-methylpyrimidine (L3) in acetonitrile (AN) were studied using a conductometric method. The formation constants of the resulting complexes were determined from computer fitting conductance-mole ratio data. The results revealed that the formation constants of L1 with metal ions are varying in order of Cr3+>Pb2+>Zn2+>Co2+>Hg2+>Ag+similar to Cd2+>Ni2+. For L2 and L3 the sequence of complex formation constants are follow as Cr3+>Pb2+>Zn2+>Co2+>Cd2+>Hg2+>Ag+>Ni2+ and Cr3+>Pb2+>Zn2+>Co2+>Ni2+similar to Hg2+similar to Cd2+similar to Ag+, respectively. The values of the thermodynamic parameters (Delta H, Delta S and Delta G) for complexation reactions were obtained from the temperature dependence of the stability constants. In all cases. the complexes were found to be enthalpy stabilized but entropy destabilized. In addition, some ab-initio quantum-mechanical calculations were carried out, in order to obtain a clue about the degree tendency of ligands to metal ions. (C) 2008 Elsevier B.V. All rights reserved.
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