Pregled bibliografske jedinice broj: 990394
Vibrational coherences of the protonated Schiff base of all-trans retinal in solution
Vibrational coherences of the protonated Schiff base of all-trans retinal in solution // Chemical Physics, 338 (2007), 2-3; 168-174 doi:10.1016/j.chemphys.2007.05.019 (međunarodna recenzija, članak, znanstveni)
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Naslov
Vibrational coherences of the protonated Schiff base of all-trans retinal in solution
Autori
Zgrablić, Goran ; Haacke, Stefan ; Chergui, Majed
Izvornik
Chemical Physics (0301-0104) 338
(2007), 2-3;
168-174
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
Femtosecond fluorescence ; Retinal Schiff bases ; Solvent effects ; Wave packets
Sažetak
Modulations in the time gated ultrafast fluorescence of the protonated Schiff base of retinal in various solvents are reported, which reflect the creation and evolution of vibrational wave packets due to the torsional mode of retinal of frequency ∼120 cm-1. The oscillations are damped in ∼400 fs. Their frequency is significantly decreased compared to the case of the protein (170 cm-1), and is insensitive to solvent properties such as the dielectric constant and the viscosity. This, along with previous results on mutants of bacteriorhodopsin, leads us to conclude that in the protein, the isomerization dynamics of retinal is governed by steric effects and by the inhomogeneous distribution of the electrostatic field due to amino-acid residues within the protein pocket. We also discuss the origin of the modulations and conclude that they are impulsively excited via the high frequency modes of retinal.
Izvorni jezik
Engleski
Znanstvena područja
Fizika, Kemija
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
