Dihydroazulene Molecular Switches: Via Ultrafast Spectroscopy To The First Bidirectional Switch

Schmidhammer, Uli; Waele, Vincent de; Buntinx, G. und Riedle, Eberhard (2004): Dihydroazulene Molecular Switches: Via Ultrafast Spectroscopy To The First Bidirectional Switch. Femtochemistry and Femtobiology: Ultrafast Events in Molecular Science, Maison de la Chimie, Paris, France, July 6–10, 2003. Martin, Monique M. und Hynes, James T. (Hrsg.): In: FEMTOCHEMISTRY and FEMTOBIOLOGY. Ultrafast Events in Molecular Science VIth International Conference on Femtochemistry. Maison de la Chimie, Paris, France July 6-10, 2003, Elsevier. S. 279-282

Abstract

We demonstrate by using ultrafast time resolved spectroscopy that the photoconversion from dihydroazulene (DHA) to vinylheptafulvene (VHF) is governed by two mechanisms: The ring opening proceeds on the excited energy surface on the picosecond time scale. It is followed by an internal conversion to the VHF ground state that is accelerated by the presence of a conical intersection in the case of cyclopenta-DHA. This conical intersection hinders the photoinduced back reaction from the final VHF products. However, we successfully photo-converted the cyanophenyl-VHF-cis back to the DHA in an experiment with two delayed pulses. This opens the route to the development of bistable dihydroazulene switches.

• Dokumententyp: Konferenzbeitrag (Paper)
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• Sprache: Englisch