| 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 |
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|
| 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 |
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