De Waele, Vincent and Beutter, Matthias and Schmidhammer, Uli and Riedle, Eberhard and Daub, Joerg (2004) Switching dynamics of the photochromic 1,1-dicyano-2-(4-cyanophenyl)-1,8a-dihydroazulene probed by sub-30 fs spectroscopy. CHEMICAL PHYSICS LETTERS, 390 (4-6). pp. 328-334. ISSN 0009-2614, 1873-4448
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We report the first time resolved investigation of the ring opening dynamics of the 1,1-dicyano-2-(4-cyanophenyl)-1,8a-dihydroazulene (CN-DHA) towards its vinylheptafulvene (CN-VHF) isomer. The kinetics are measured by sub-30 fs transient absorption spectroscopy for numerous probe wavelengths from 485 to 690 nm. The ring opening takes place within 1.2 ps on the CN-DHA-VHF S-1 potential energy surface. It is followed by the internal conversion from CN-VHF-S-1 to CN-VHF-S-0 in 13 ps. We observe coherent oscillations of low frequency modes (150, 190, 330 and 500 cm(-1)) that are closely associated with the skeleton motions driving the CN-DHA structural changes immediately after the 30 fs UV excitation. (C) 2004 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RING-OPENING REACTION; DIHYDROAZULENE-VINYLHEPTAFULVENE PHOTOCHROMISM; UV-MID-IR; DIHYDROAZULENE/VINYLHEPTAFULVENE PHOTOCHROMISM; ABSORPTION-SPECTROSCOPY; TRANSIENT ABSORPTION; CONICAL INTERSECTION; SPIROPYRAN; SYSTEMS; DITHIENYLETHENE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Alumni or Retired Professors > Prof. Dr. Jörg Daub |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Jul 2021 05:58 |
| Last Modified: | 14 Jul 2021 05:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37562 |
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