| 光谱学与光谱分析 |
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| Study on the Effect of Pressure on the Molecular Structure and π-Electron Delocalization of β-Carotene by Raman Spectroscopy |
| WU Nan-nan1, 3, OUYANG Shun-li2*, LI Zuo-wei1* |
1. College of Physics, Jilin University, Changchun 130023, China
2. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources，Inner Mongolia University of Science & Technology, Baotou 014010, China
3. School of Rare Earth, Inner Mongolia University of Science and Technology, Baotou 014010，China |
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Abstract In the present paper, studies on in-situ Raman spectra at high pressure up to 12.85 Gpa were performed on β-carotene using a diamond anvil cell (DAC), and the effects of pressure on the characteristic peaks and π-electron delocalization of β-carotene were discussed. The results showed that Raman frequencies of the main characteristic peaks of β-carotene shifted to high wavenumber with the increase in pressure. The relation between pressure and the three main characteristic peaks of β-carotene was given as follows：ν1(CC)=4.74P+1 511.4, ν2(C—C)=2.55P+1 157.6 and ν3(CH3)=2.25P+1 011.3. Under the pressure of 5.38 GPa, Raman spectrum of ν1+ν2 sum frequency of β-carotene was subjected to cleavage. Fuethermore, the degree of π-electron decolization was reduced with the increase in pressure, leading to CC double bond more compressible than C—C bond on the main chain of β-carotene.
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Received: 2013-01-13
Accepted: 2013-03-18
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Corresponding Authors:
OUYANG Shun-li, LI Zuo-wei
E-mail: ouyangshunli@imust.cn;zuowei_li@163.com
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