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Please use this identifier to cite or link to this item: https://dspace.ffh.bg.ac.rs/handle/123456789/1007
Title: Delphinidin-aluminum(III) complexes in aqueous and non-aqueous media: Spectroscopic characterization and theoretical study
Authors: Dimitrić Marković, Jasmina 
Marković, Zoran S.
Baranac, Jelisaveta M.
Dašić, Marina L.
Keywords: Absorption spectra;Aluminum;Complex formation;Delphinidin;Semiempirical calculations;Stability constants;Stoichiometry
Issue Date: 1-Dec-2007
Journal: Monatshefte fur Chemie
Abstract: 
The study of delphinidin complexation with trivalent aluminum in acidic aqueous buffered (pH 3.0 and 3.8) and methanolic solutions was performed utilizing electronic absorption spectroscopy and quantum chemical calculations. In its structure delphinidin possesses several chelating sites in competition towards aluminum(III). Molar ratio plots denoted the formation of only one aluminum(III):delphini...
The study of delphinidin complexation with trivalent aluminum in acidic aqueous buffered (pH 3.0 and 3.8) and methanolic solutions was performed utilizing electronic absorption spectroscopy and quantum chemical calculations. In its structure delphinidin possesses several chelating sites in competition towards aluminum(III). Molar ratio plots denoted the formation of only one aluminum(III):delphinidin complex of stoichiometry of 1:1 in both investigated media. Semiempirical calculations, performed at the restricted HF AM1 level, enabled the determination of the structural features of free delphinidin and structural modifications caused by chelation of aluminum(III). Considering the pigment molecular structure and the results of the theoretical calculations it is possible to equally implicate C3′-C4′ and C4′-C5′ hydroxyl groups as those with the predominant chelating power. © 2007 Springer-Verlag.
URI: https://dspace.ffh.bg.ac.rs/handle/123456789/1007
ISSN: 0026-9247
DOI: 10.1007/s00706-007-0741-z
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University of Belgrade
Faculty of Physical Chemistry
Studentski trg 12-16
11158 Belgrade 118
PAC 105305
SERBIA
University of Belgrade Faculty of Physical Chemistry

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