Molecules 2011, 16(3), 1973-1980; doi:10.3390/molecules16031973
Article

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

Ming-Ming Huo 1 email, Wei-Long Liu 1,* email, Zhi-Ren Zheng 1,* email, Wei Zhang 1 email, Ai-Hua Li 1 email and Da-Peng Xu 2 email
1 Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, 150001, China 2 College of Physics, Ji Lin University, Changchun 130023, China
* Authors to whom correspondence should be addressed.
Received: 25 November 2010; in revised form: 8 February 2011 / Accepted: 10 February 2011 / Published: 25 February 2011
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Abstract: 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.
Keywords: pressure; structure; Raman; lycopene; β-carotene

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MDPI and ACS Style

Huo, M.-M.; Liu, W.-L.; Zheng, Z.-R.; Zhang, W.; Li, A.-H.; Xu, D.-P. Effect of End Groups on the Raman Spectra of Lycopene and β-Carotene under High Pressure. Molecules 2011, 16, 1973-1980.

AMA Style

Huo M-M, Liu W-L, Zheng Z-R, Zhang W, Li A-H, Xu D-P. Effect of End Groups on the Raman Spectra of Lycopene and β-Carotene under High Pressure. Molecules. 2011; 16(3):1973-1980.

Chicago/Turabian Style

Huo, Ming-Ming; Liu, Wei-Long; Zheng, Zhi-Ren; Zhang, Wei; Li, Ai-Hua; Xu, Da-Peng. 2011. "Effect of End Groups on the Raman Spectra of Lycopene and β-Carotene under High Pressure." Molecules 16, no. 3: 1973-1980.

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