Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lu, YC | en_US |
dc.contributor.author | Diau, EWG | en_US |
dc.contributor.author | Rau, H | en_US |
dc.date.accessioned | 2014-12-08T15:19:30Z | - |
dc.date.available | 2014-12-08T15:19:30Z | - |
dc.date.issued | 2005-03-17 | en_US |
dc.identifier.issn | 1089-5639 | en_US |
dc.identifier.uri | http://dx.doi.org/10.1021/jp044934b | en_US |
dc.identifier.uri | http://hdl.handle.net/11536/13893 | - |
dc.description.abstract | The ultrafast relaxation dynamics of two rotation-restricted (azobenzeno-2S-phane and azobenzeno-4S-phane) and one rotation-free (4,4'-dimethylazobenzene) azobenzene derivatives were investigated using femtosecond fluorescence up-conversion on both S-1(n,pi*) and S-2(pi,pi*) excitations. On S-2 excitation, pulse-limited kinetics with a decay coefficient of similar to 100 fs corresponding to ultrafast S-2-> S-1 relaxation is found to be common for all molecules under investigation regardless of the molecular structure. This indicates that a direct rotational. relaxation on the S-2 surface is unfavorable. On S-1 excitation, we observed biphasic fluorescence decay with a femtosecond component attributed to the decay of the Franck-Condon state prepared by excitation and a picosecond component attributed to the deactivation of the relaxed molecule on the S, surface. This picosecond component is slowed by at least a factor of 2 for the rotation-restricted 2S-bridged molecule compared to that of the rotation-free molecule; for the even stronger rotation-restricted azobenzeno-4S-phane, the decrease is by a factor of 10. These differences in deactivation suggest that the relaxed states and probably the trajectories for rotation-free and rotation-restricted molecules are different on the S, surface, which should be important for the quantum yield of photoisomerization. | en_US |
dc.language.iso | en_US | en_US |
dc.title | Femtosecond fluorescence dynamics of rotation-restricted azobenzenophanes: new evidence on the mechanism of trans -> cis photoisomerization of azobenzene | en_US |
dc.type | Article | en_US |
dc.identifier.doi | 10.1021/jp044934b | en_US |
dc.identifier.journal | JOURNAL OF PHYSICAL CHEMISTRY A | en_US |
dc.citation.volume | 109 | en_US |
dc.citation.issue | 10 | en_US |
dc.citation.spage | 2090 | en_US |
dc.citation.epage | 2099 | en_US |
dc.contributor.department | 應用化學系分子科學碩博班 | zh_TW |
dc.contributor.department | Institute of Molecular science | en_US |
dc.identifier.wosnumber | WOS:000227630200009 | - |
dc.citation.woscount | 57 | - |
Appears in Collections: | Articles |
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