research article

Vibrational coherences of the protonated Schiff base of all-trans-retinal in solution

Zgrablic, Goran  
•
Haacke, Stefan
•
Chergui, Majed  
2007
Chemical Physics

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 .apprx.120 cm-1. The oscillations are damped in .apprx.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 dielec. const. 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.

Type
research article
DOI
10.1016/j.chemphys.2007.05.019
Web of Science ID

WOS:000250665800012

Author(s)
Zgrablic, Goran  
Haacke, Stefan
Chergui, Majed  
Date Issued

2007

Published in
Chemical Physics
Volume

338

Issue

2-3

Start page

168

End page

174

Subjects

Molecular vibration (coherences; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Isomerization (dynamics; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Reaction kinetics (fluorescence; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Steric effects (isomerization dynamics in relation to; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Frequency (modulation

•

solvent properties in relation to; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Vibrational frequency (oscillations; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Schiff bases Role: PRP (Properties) (protonated

•

of retinal; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Electrostatic field (specific distribution

•

isomerization dynamics in relation to; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Solvent effect (time-gated ultrafast fluorescence; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Fluorescence (time-gated

•

ultrafast; vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Wave packets (vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.); Retinoids Role: PRP (Properties) (vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.)

•

retinal protonated Schiff base ultrafast fluorescence vibrational coherence; oscillation frequency retinal protonated Schiff base; dielec const retinal protonated Schiff base; viscosity retinal protonated Schiff base; steric effect isomerization dynamics retinal protein complex; electrostatic field inhomogeneous distribution retinal protein complex

Note

CAN 147:522417

30-20

Terpenes and Terpenoids

Laboratoire de Spectroscopie Ultrarapide, BSP, ISIC,Ecole Polytechnique Federale de Lausanne,Lausanne,Switz.

Journal

written in English.

116-31-4 (all-trans-Retinal); 116-31-4D (all-trans-Retinal) Role: PRP (Properties) (vibrational coherences of the protonated Schiff base of all-trans-retinal in soln.)

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
Available on Infoscience
March 18, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/36198