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
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.
吴楠楠1, 3，欧阳顺利2*，里佐威1*. 高压对β-胡萝卜素分子结构及π-电子离域影响的拉曼光谱研究[J]. 光谱学与光谱分析, 2013, 33(09): 2429-2432.
WU Nan-nan1, 3, OUYANG Shun-li2*, LI Zuo-wei1*. Study on the Effect of Pressure on the Molecular Structure and π-Electron Delocalization of β-Carotene by Raman Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(09): 2429-2432.
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