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Metal complexes of antiuralethic drug: Synthesis, spectroscopic characterization and thermal study on allopurinol complexes
Faculty
Science
Year:
2008
Type of Publication:
Article
Pages:
416-429
Authors:
El-Megharbel, S. M, Refat, M. S, El-Wahed, M. G. Abd
DOI:
10.1016/j.molstruc.2008.01.009
Journal:
JOURNAL OF MOLECULAR STRUCTURE ELSEVIER SCIENCE BV
Volume:
888
Research Area:
Chemistry
ISSN
ISI:000260270200053
Keywords :
Allopurinol, Pyrimidine and Pyrazole rings, Infrared spectra, Thermal analysis
Abstract:
Mn(II), Co(II), Ni(II), Cu(II), Zn(ll), Cd(II) and Hg(II) complexes of the allopurinol ligand, (H2L; Alp=(C5H4N4O)), were synthesized and characterized by microanalyses, magnetic susceptibility, conductance, infrared, electronic spectral and thermogravimetric (TGA/DTG) measurements. The ligand can be coordinated as a bidentate feature via pyrazole and/or pyrimidine rings. Spectroscopic and magnetic data are consistent with configuration of square planar geometry for the Mn(II), Co(II), Zn(II), Cd(II) and Hg(II) complexes while the Ni(II) and Cu(II) complexes are octahedral. From the thermal degradation curves, the uncoordinated water molecules are removed in a first stage while the decomposition of ligand beside coordinated water molecules occur in the second and subsequence steps. The kinetic thermodynamic parameters such as: E{*} Delta H{*}, Delta S{*} and Delta G{*} are estimated from the DTG curves using Coats and Red-fern (CR) and Horowitz-Metzger equations. (C) 2008 Elsevier B.V. All rights reserved.
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