Spectroscopic and Theoretical Study of Cyanidin-Aluminum (III) Complexes

Complexation of aluminum (III) with cyanidin, a natural anthocyanidin molecule, has been investigated in methanol and buffered solutions of pH 3.0 and 4.0. Electronic absorption spectroscopy was performed to characterize the stoichiometry and stability of the complexes formed. In investigated solven...

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Bibliographic Details
Published in:Spectroscopy letters 2008-04, Vol.41 (3), p.104-115
Main Authors: Dimitrić Marković, Jasmina M., Veselinović, Dragan S., Baranac, Jelisaveta M., Brdarić, Tanja P.
Format: Article
Language:English
Subjects:
aluminum (III)
complex formation
cyanidin
electronic spectra
semiempirical calculations
stability constants
stoichiometry
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Summary:Complexation of aluminum (III) with cyanidin, a natural anthocyanidin molecule, has been investigated in methanol and buffered solutions of pH 3.0 and 4.0. Electronic absorption spectroscopy was performed to characterize the stoichiometry and stability of the complexes formed. In investigated solvents, aluminum bonded moderately to cyanidin requiring large mole ratios of the components (up to 200) for the access of complexation. Molar ratio plots showed the formation of only one complex with stoichiometry aluminum (III):cyanidin of 1∶1 in both investigated media. Semiempirical calculations, performed in the Austin Model 1 parameterization, enabled the determination of the structural features of free compounds as well as complex structural modifications caused by chelation of Al(III).
ISSN:0038-7010
1532-2289
DOI:10.1080/00387010701799704