Synthesis, characterization and antioxidant activity copper–quercetin complex

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Abstract

Quercetin (3,3',4',5,7-pentahydroxyflavone) one of the most abundant dietary flavonoids, has been investigated in the presence of Cu(II) in methanol. The spectroscopic studies (UV-vis, (1)H NMR and IR) were useful to assess the relevant interaction of Quercetin with Cu(II) ions, the chelation sites and dependence of the complex structure from the metal/ligand ratio. A 1:2 (L:M) complex was indicated by Job's method of continuous variation, which was applied to ascertain the stoichiometric composition of the complex. The antioxidant activities of the compounds were evaluated by using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging method. The complexed flavonoid was much more effective free radical scavengers than the free flavonoids.

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Journal

Title: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Abbreviated Title: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Publisher: Elsevier BV

ISSN (Print): 13861425

Publication date Created: January 2009

Publication date (Print): January 2009

Volume: 71

Issue: 5

Pages: 1901-1906

Article

DOI: 10.1016/j.saa.2008.07.030

PubMed ID: 18783981

SO-VID: 1e15de73-8c38-44df-bbf9-84fb64c2d532

License:

http://www.elsevier.com/tdm/userlicense/1.0/

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