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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 6,





ELEONORA MARIAN, TUNDE JURCA, FLORIN BANICA, CLAUDIA MORGOVAN, IOAN BRATU
Thermal Analysis and Raman Spectrometry of Some Complexes
of Theophylline with Transitional Metals

Abstract:

This paper presents the characterization of four new theophylline compounds with transition metal ions (Cu2+, Cd2+, Co2+, Zn2+) by Raman spectrometry and thermal analysis. The elemental analysis gives a coordination ratio of 1:2 metal:theophylline. Raman analyses confirm the existence of these complex combinations by the disappearance of the vibrations due to the atoms implied in the coordinative bonds and the presence of the characteristic bands of metal-theophylline in the 700-500 cm-1 spectral region. In theophylline the atoms N1 and N3 are blocked by methyl group and N7 and O6 atoms could be implied in coordinative bonds with metal cations. Results of the Raman spectra demonstrated that each complex included crystallization water molecules. Thermal analysis demonstrated that each complex included four crystallization water molecules. Keywords: new complexes theophylline with transition metals, Raman spectrometry, thermal analysis


Issue: 2010, Volume 61, Issue 6
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