Effect of Temperature on the Raman Spectrum of Short-chain Polyenes Biological Molecules β-Carotene

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (9): 1864.

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Effect of Temperature on the Raman Spectrum of Short-chain Polyenes Biological Molecules β-Carotene

WANG Wei-Wei^1,2, LI Liang², LI Zhan-Long², SUN Cheng-Lin^1,2*, OUYANG Shun-Li², XU Da-Peng², QU Guan-Nan², LI Zuo-Wei^1,2, GAO Shu-Qin², CAO Jun-Sheng³, GAO Feng-Li⁴, ZHOU Qiang¹

1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130021, China;
2. College of Physics, Jilin University, Changchun 130023, China;
3. Lab of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
4. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China

Received:2009-11-30 Online:2010-09-10 Published:2010-09-10
Contact: SUN Cheng-Lin. E-mail: chenglin@jlu.edu.cn
Supported by:
国家自然科学基金(批准号： 10774057, 10974067), 集成光电子国家重点联合实验室开放课题(批准号: IOSKL-KF200908), 吉林大学超硬材料重点实验室开放课题(批准号: 201008), 吉林大学研究生创新基金资助项目(批准号: 20101046)资助.

Abstract

Abstract: Raman spectra of β-carotene with 9 conjugated double bonds polyenes bioligical molecules were measured in dimethyl sulfoxide(DMSO) solution, at temperature range from 298 K to 346 K(25—73 ℃) in this experiment by Gobin Yvon hr800 Raman spectrometer commreted Linkam, Thms600 heating device. The results show that short-chain polyenes biological molecules β-carotene have larger Raman scattering cross section[6.5×10^-23 cm²/(molecule?Sr)]. Besides resonance effect, the molecular structural order of β-carotene, which can generate coherent weak damping C-C bond vibration is an important factor, can lead to high Raman scattering cross section. The temperature has great effect on polyenic linear molecular structural order. Due to the temperature increases, the molecular structural order of β-carotene decreases, which lead to the weak of coherent weakly damping C-C bond vibration, the C-C bond length changes short. Because the C-C bond length is slightly different, the Raman scattering cross section decreases. And the frequency shifts towards higher frequencies, the frequency components of vibration increase, and the Raman linewidth becomes broadened.

Key words: Molecular structural order, Raman scattering cross-section, Blue shift, Polyenes molecule

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WANG Wei-Wei, LI Liang, LI Zhan-Long, SUN Cheng-Lin*, OUYANG Shun-Li, .... Effect of Temperature on the Raman Spectrum of Short-chain Polyenes Biological Molecules β-Carotene[J]. Chem. J. Chinese Universities, 2010, 31(9): 1864.

References

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Effect of Temperature on the Raman Spectrum of Short-chain Polyenes Biological Molecules β-Carotene

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