Resonance Raman Spectral Properties Studies of β-Carotene in Solution
SUN Mei-jiao1,2, LIU Shuo2, LIU Tian-yuan2, XU Sheng-nan2, SUN Cheng-lin2, ZHOU Mi2*, LI Zuo-wei2
1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China 2. College of Physics, Jilin University, Changchun 130012, China
Abstract:β-carotene is an important kind of polyene biomolecules, which has significant applications on researching optoelectronic and functional materials. In-situ high pressure Raman spectra of β-carotene are measured in CS2 solution and water respectively at pressure range from 0~0.60 GPa. Then we compared both of them the Raman shift and CC bond of the full width at half maximum (FWHM) of the Raman spectra. It is therefore concluded that both of the samples’ Raman shift moved to the high wave number and the full width at half maximum increased depending of the pressure. The experiment phenomena were interpreted by the theory of “coherent weakly damped electronic-lattice vibration model” and “effective conjugation length model”. The mechanism is that the β-carotene is compressed and has the lower structure order, shorte the effective conjugation length, decreased Raman active, weaker the coherent weakly damping CC bond vibration in high pressure. Because of the CC bond length become short, so the Raman spectra are found to blueshift. The CC bond of the full width at half maximum (FWHM) of the Raman spectra increased is attributed to the increase of difference in C—C and CC bond lengths. Moreover, due to dissolving in non-polar CS2 solvent, the β-carotene encounters the interaction of the surrounding solvent molecules. So the dispersion force interaction between solute and solvent is more sensitive to pressure. Then it makes that the slop of Raman shift and the full width at half maximum in the CS2 solution are faster than dissolved in water with increasing pressure. This paper provides an application value for research on molecular structure change under the external field and the presence form of polyenes biomolecules in the solvent.
Key words:Raman spectra;β-carotene;Structured order
[1] QU Guan-nan, LI Dong-fei, LI Zhan-long(曲冠男, 李东飞, 李占龙). Acta Physica Sinica(物理学报), 2010, 59: 3168. [2] Kirsh V A, Hayes R B, Katunar M R,et al. Natl. Cancer I,2006, 98(4):245. [3] Chu B S, Ichikawa S, Kanafusa S, et al. Journal of the American Oil Chemists’ Society, 2007, 84(11): 1053. [4] Oliveira V E, Castro H V, Edwards H G M, et al. Journal of Raman Spectroscopy, 2010, 41(6): 642. [5] Di Mascio P, Kaiser S, Sies H. Archives of Biochemistry and Biophysics, 1989, 274(2): 532. [6] WU Nan-nan, OUYANG Shun-li, LI Zuo-wei(吴楠楠, 欧阳顺利, 里佐威). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2013, 33(9): 2429. [7] WU Yong-ling, LIU Tian-yuan, SUN Cheng-lin(吴咏玲, 刘天元, 孙成林). Acta Physica Sinica(物理学报), 2013, 62(3): 37801. [8] Widjaja E, Garland M. Talanta, 2010, 80(5): 1665. [9] Chiang C K, Fincher C R, Park Y W, et al. Phys. Pev. Lett., 1977, 39: 1098. [10] LIU Wei-long(刘伟龙). Steady-State and Ultrafast Spectroscopy of β-carotene Under High Pressure(β-胡萝卜素的高压稳态和超快光谱研究). 2009. 6 [11] WANG Wei-wei, LI Liang, LI Zhan-long(王微微, 李 亮, 李占龙). Chemical Journal of Chinese Universities(高等学校化学学报), 2010,(9): 1864. [12] Liu Weilong, Wang Z G, Zheng Z R, et al. J. Phy. Chem. A, 2008, 112:10580. [13] QU Guan-nan, LI Shuo, SUN Mei-jiao(曲冠男, 李 硕, 孙美娇). Acta Physica Sinica(物理学报), 2013, 62(7): 77801.