Effect of High Pressure on the Molecular Structure and π-Electrons Delocalization of Canthaxanthin as Revealed by Raman SpectraReport as inadecuate




Effect of High Pressure on the Molecular Structure and π-Electrons Delocalization of Canthaxanthin as Revealed by Raman Spectra - Download this document for free, or read online. Document in PDF available to download.

Journal of Spectroscopy - Volume 2015 2015, Article ID 467089, 5 pages -

Research Article

Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China

School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

Department of Fundamental Physics, College of Science, China University of Petroleum, Qingdao, Shandong 266555, China

Received 30 May 2015; Revised 27 July 2015; Accepted 10 August 2015

Academic Editor: Christoph Krafft

Copyright © 2015 Shun-li Ou-Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of high pressure on the molecular structure and π-electron delocalization of canthaxanthin was studied by in situ resonance Raman spectroscopy. Changes in the characteristic band frequency and the pressure of canthaxanthin were described. The effect of pressure on π-electron delocalization was also discussed. Results show that the characteristic bands of canthaxanthin increase and reach high wavenumbers. The correlations between Raman frequency of the three main bands and pressure are listed as follows: C=C = 3.43P + 1512.3, C-C = 3.29P + 1156.1, and CH3 = 2.16P + 1006.3. The frequency multiplication of canthaxanthin changes as pressure is altered. The pressure effect on the C=C mode is more susceptible than on the C-C mode, which can be explained by the fact that the β-ring twists to a larger angle from the plane of the conjugated main chain under high pressure, leading to a lower degree of the π-electrons delocalization. The Raman spectra are recovered after the compression-decompression cycle indicating the canthaxanthin has no evident phase change under our experimental conditions.





Author: Shun-li Ou-Yang, Nan-nan Wu, and Yan-jie Tian

Source: https://www.hindawi.com/



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