Publication Type |
Journal Article |
Title |
Ultrafast Internal Conversion in a Model Anthocyanin-Polyphenol Complex: Implications for the Biological Role of Anthocyanins in Vegetative Tissues of Plants |
Authors |
Rita Franca Rodrigues Palmira Ferreira da Silva Karina Shimizu Adilson Alves de Freitas Sergey A. Kovalenko Nikolaus P. Ernsting Frank H. Quina A. L. Maçanita |
Groups |
MET |
Journal |
CHEMISTRY-A EUROPEAN JOURNAL |
Year |
2009 |
Month |
Notice: Undefined index: in /afs/ist.utl.pt/groups/cqe/web/tmp/templates_c/77f86a5f762542dadf50c7f7fefa96acd45c2726_0.file.paper.tpl.html.php on line 163
|
Volume |
15 |
Number |
6 |
Pages |
1397-1402 |
Abstract |
The red flavylium cations of anthocyanins form ground-state charge-transfer complexes with several naturally occurring electron-donor copigments, such as hydroxylated flavones and hydroxycinnamic or benzoic acids. Excitation of the 7-methoxy-4-methyl-flavylium-protocatechuic acid complex results in ultrafast (240 fs) internal conversion to the ground state of the complex by way of a low-lying charge-transfer state. Thus, both un-complexed anthocyanins, whose excited state decays by fast (5-20ps) excited-state proton transfer, and anthocyanin-copigment complexes have highly efficient mechanisms of deactivation that are consistent with the proposed protective role of anthocyanins against excess solar radiation in the vegetative tissues of plants. |
DOI |
http://dx.doi.org/10.1002/chem.200801207 |
ISBN |
|
Publisher |
WILEY-V C H VERLAG GMBH |
Book Title |
|
ISSN |
0947-6539 |
EISSN |
1521-3765 |
Conference Name |
|
Bibtex ID |
ISI:000263093800015 |
Observations |
|