光谱学与光谱分析 |
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THz Absorption Spectra of Several Carbohydrate Derivatives |
YANG Li-min1,ZHAO Kui1,SUN Hong-qi2,ZHAO Guo-zhong2,YANG Guang-bin3,TIAN Wen4,WENG Shi-fu4, ZHANG Liang-liang2,WANG Yu-gang1,LU Xiang-yang1,XIE Da-tao1,XU Yi-zhuang4,ZHANG Cun-lin2, WU Jin-guang4,CHEN Jia-er1 |
1. Institute of Heavy Ion Physics, Key Laboratory of Heavy Ion Physics, Ministry of Education and School of Physics, PekingUniversity, Beijing 100871, China 2. Department of Physics, Capital Normal University, Beijing 100037, China 3. Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing 100085, China 4. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
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Abstract Intermolecular hydrogen bond vibrations may be observed in the THz range. Carbohydrates are important bio-molecules, and are the typical systems for the study of hydrogen bonds. Carbohydrate derivatives have critical biological functions, and there are extensive hydrogen bond networks in molecular system, therefore, they would have various bands in the THz region. The THz absorption spectra of several carbohydrate derivatives were measured using a THz apparatus at room temperature. The THz bands are as follows: 1.17, 1.35, 1.93 and 2.23 THz for isopropyl-β-D-thioglucopyranoside; 1.93 THz for isopropyl-β-D- thiogalactopyranoside; 1.87 THz for methyl-(tetra-O-acetyl-β-D-galactopyranoside); 1.23, 1.70, 1.84 and 2.23 THz for O-(2,3,4,6-tetra-O-acetyl-β-glucopyranosyl)-N-hydroxysuccinimide. The results indicate that different samples have various bands that originated from collective modes of the whole molecules and especially isomers can be distinguished, showing that THz method is sensitive to the molecular structures and spatial configurations and is a helpful complement of IR spectroscopy.
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Received: 2006-05-10
Accepted: 2006-08-20
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Corresponding Authors:
YANG Li-min
E-mail: yanglm@pku.edu.cn
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