Effect of End Groups on the Raman Spectra of Lycopene and β-Carotene under High Pressure

Molecules

Ming-Ming Huo¹  Wei-Long Liu¹  Zhi-Ren Zheng¹  Wei Zhang¹  Ai-Hua Li¹ 

[1] ¹Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, 150001, China ²College of Physics, Ji Lin University, Changchun 130023, China

关键词: pressure;    structure;    Raman;    lycopene;    β-carotene;   

DOI  :  10.3390/molecules16031973

来源: mdpi

【 摘 要 】

The Raman spectra of all-trans-lycopene in n-hexane were measured under high pressure, and the results compared with those of β-carotene. The different pressure effects on Raman spectra are analyzed taking into account the different structures of lycopene and β-carotene molecules. It is concluded that: (a) the vibronic coupling between the S₁ and S₀ states of β-carotene is stronger than that of lycopene, (b) the diabatic frequency increment of the ν₁ mode is more susceptible to pressure than that of the ν₂ mode for lycopene, and (c) β-rings rotation can relieve the pressure effect on the C=C bond length in β-carotene. This work provides some insights for elucidating the structural and environmental effects on Raman spectra of carotenoids.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.