Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5375078 | Chemical Physics | 2010 | 6 Pages |
Abstract
Using time-dependent density functional theory, the excited electronic states of the astaxanthin radical cation (AXT+) are investigated. While the optically allowed excited D1 and D3 states are typical ÏÏâ excited states, the D2 and D4 states are nÏâ states. Special emphasis is put onto the influence of the carbonyl groups onto the excited states. For this objective, the excited states of four hypothetical carotenoids and zeaxanthin have been computed. Addition of a carbonyl group to a conjugated carbon double bond system does essentially not change the vertical excitation energies of the optically allowed ÏÏâ states due to two counter-acting effects: the excitation energy should increase due to the -M-effect of the carbonyl group and at the same time decrease owing to the elongation of the conjugated double bond system by the carbonyl group itself.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Andreas Dreuw, Jan Hendrik Starcke, Josef Wachtveitl,