【摘要】 分子间氢键等振动可以出现在THz波段。糖类是重要的生物分子,是研究氢键的典型体系。糖的衍生物分子具有重要的功能,同时由于它们的特殊的分子结构,通常有大量氢键存在,使得它们在THz波段表现出一定的光谱特征。文章测定了几种糖衍生物分子的THz光谱,结果表明不同分子具有不同的光谱,异丙基--βD-硫代葡萄糖具有1.17,1.35,1.93,2.23 THz等多个吸收峰;异丙基--βD-硫代半乳糖的吸收峰位于1.93 THz处;甲基-(四-氧-乙酰基--βD-半乳糖)的吸收峰位于1.87 THz处;氧-(2,3,4,6-四-氧-乙酰基--βD-葡萄糖)-氮-羟基琥珀酰亚胺具有1.23,1.70,1.84,2.23 THz等多个吸收峰。对结构相似的分子,尤其对于异构体来说,它们具有不同的峰位,这些低频振动为包含氢键在内的整个分子的振动,说明THz方法能够鉴别异构体,是对结构变化、空间构型等很敏感的技术,是红外光谱的有益补充。这也为大分子的光谱研究提供了基础。更多还原

【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-acetylβ-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.更多还原