Document Detail


Effect of pressure and solvent on Raman spectra of all-trans-beta-carotene.
MedLine Citation:
PMID:  17880189     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The ground state Raman spectra of all-trans-beta-carotene in n-hexane and CS2 solutions are measured by simultaneously changing the solvent environment and molecular structure under high hydrostatic pressure. The diverse pressure dependencies of several representative Raman bands are explained using a competitive mechanism involving bond length changes and vibronic coupling. It is therefore concluded that (a) the in-phase C=C stretching mode plays an essential role in the conversion of energy from S1 to S0 states in carotenoids, (b) internal conversion and intramolecular vibrational redistribution can be accelerated by high pressure, and (c) the environmental effect, but not the structural distortion or pi-electron delocalization, is responsible for the spectral properties of a given carotenoid species. These findings revealed the potential of high pressure in exploring the nature of the biological functions of carotenoids.
Authors:
Wei-Long Liu; Zhi-Ren Zheng; Rui-Bin Zhu; Zhi-Guo Liu; Da-Peng Xu; Hua-Min Yu; Wen-Zhi Wu; Ai-Hua Li; Yan-Qiang Yang; Wen-Hui Su
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-09-20
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  111     ISSN:  1089-5639     ISO Abbreviation:  J Phys Chem A     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-04     Completed Date:  2007-11-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  10044-9     Citation Subset:  IM    
Affiliation:
Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China.
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MeSH Terms
Descriptor/Qualifier:
Biophysics / methods
Carotenoids / chemistry
Chemistry, Physical / methods
Hexanes / chemistry
Models, Chemical
Models, Statistical
Pressure
Spectrometry, Fluorescence / methods
Spectrum Analysis, Raman / methods*
Vibration
beta Carotene / chemistry*
Chemical
Reg. No./Substance:
0/Hexanes; 36-88-4/Carotenoids; 7235-40-7/beta Carotene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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