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Synthesis, spectroscopic characterization, thermal analysis and electrical conductivity studies of Mg(II), Ca(II), Sr(II) and Ba(II) vitamin B2 complexes
Faculty
Science
Year:
2011
Type of Publication:
Article
Pages:
194-201
Authors:
Refat, Moamen S, Moussa, Mohamed A. A, Mohamed, Soha F
DOI:
10.1016/j.molstruc.2011.03.017
Journal:
JOURNAL OF MOLECULAR STRUCTURE ELSEVIER SCIENCE BV
Volume:
994
Research Area:
Chemistry
ISSN
ISI:000291085700027
Keywords :
Alkaline earth metal(II), Vitamin B2, Spectroscopic studies, Thermal analyses, DC electrical conductivity
Abstract:
Riboflavin (RF) complexes of Mg(II), Ca(II), Sr(II) and Ba(II) were successfully synthesized. Structures of metal complexes obtained were confirmed and characterized by elemental analysis, molar conductance, and infrared spectra. DC electrical conductivity measurements indicated that the alkaline earth metal (II) complexes of RF ligand are non-electrolytes. Elemental analysis of chelates suggest that the metal(II) ligand ratio is 1:2 with structure formula as {[}M(RF)(2)(X)(2)]center dot nH(2)O. Infrared assignments clearly show that RF ligand coordinated as a bidentate feature through azomethine nitrogen of pyrazine ring and C=O of pyrimidine-2,4-dione. Thermal analyses of Mg(II), Ca(II). Sr(II) and Ba(II) complexes were investigated using (TG/DSC) under atmospheric nitrogen between 30 and 800 degrees C. The surface morphology of the complexes was studied by SEM. The electrical conductivities of RF and its metal complexes were also measured with DC electrical conductivity in the temperature range from room to 483 K. (c) 2011 Elsevier B.V. All rights reserved.
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