Coherent high-frequency vibrational dynamics in the excited electronic state of all-trans retinal derivatives

• Verfasst von: Kraack, Jan Philip [VerfasserIn]
• Verfasst von: Buckup, Tiago [VerfasserIn]
• Verfasst von: Motzkus, Marcus [VerfasserIn]
• Titel: Coherent high-frequency vibrational dynamics in the excited electronic state of all-trans retinal derivatives
• Verf.angabe: Jan Philip Kraack, Tiago Buckup, and Marcus Motzkus
• E-Jahr: 2013
• Jahr: January 10, 2013
• Umfang: 5 S.
• Fussnoten: Gesehen am 04.11.2021
• Titel Quelle: Enthalten in: The journal of physical chemistry letters
• Ort Quelle: Washington, DC : ACS, 2010
• Jahr Quelle: 2013
• Band/Heft Quelle: 4(2013), 3, Seite 383-387
• ISSN Quelle: 1948-7185
• DOI: doi:10.1021/jz302001m
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 175258371X

Abstract

Coherent vibrational dynamics of retinal in excited electronic states are of primary importance in the understanding of photobiology. Using pump-DFWM, we demonstrate for the first time the existence of coherent double-bond high-frequency modulations (>1300 cm-1) in the excited electronic state of different retinal derivatives. All-trans retinal as well as retinal Schiff bases exhibit a partial frequency downshift of the C═C double-bond mode from ∼1580 cm-1 in the ground state to 1510 cm-1 in the excited state. In addition, a new vibrational band at ∼1700 cm-1 assigned to the C═N stretching mode in retinal Schiff bases in the excited state is detected. The newly reported bands are observed only in specific spectral regions of excited-state absorption. Implications regarding the observation of vibrational coherences in naturally occurring retinal protonated Schiff bases in rhodopsins are discussed.