物理化学学报 >> 2001, Vol. 17 >> Issue (04): 343-347.doi: 10.3866/PKU.WHXB20010413

研究论文 上一篇    下一篇

β-环糊精和部分有机物分子识别作用的焓熵判断

郑小明;陆维敏;孙得志   

  1. 浙江大学催化研究所,杭州 310028;聊城师范学院化学系,聊城 252059
  • 收稿日期:2000-09-15 修回日期:2000-12-14 发布日期:2001-04-15
  • 通讯作者: 郑小明 E-mail:cuihua@dial.zju.edu.cn

Enthalpy and Entropy Criterion for the Molecular Recognize of Some Organic Compounds with Beta Cyclodextrin

Zheng Xiao-Ming;Lu Wei-Min;Sun De-Zhi   

  1. Institute of Catalysis,Xixi Campus,Zhejiang University,Hangzhou 310028;Department of Chemistry,Liaocheng Teachers′College,Liaocheng 252059
  • Received:2000-09-15 Revised:2000-12-14 Published:2001-04-15
  • Contact: Zheng Xiao-Ming E-mail:cuihua@dial.zju.edu.cn

摘要: 应用气相色谱实验技术,测定了一些有机溶剂(或溶质)在β-环糊精(β-CD)固体表面上的吸附热力学函数.实验结果表明,气相中的有机物质在β-CD表面上的吸附过程之焓、熵互补现象与它们之间的分子识别作用密切相关,它们的绝对值之和可以作为分子识别作用强弱的判据.

关键词: 分子识别, β-环糊精, 焓, 熵, 判据

Abstract: Adsorption thermodynamic functions for some organic solvent molecules on the surface of beta cyclodextrin(β-CD)have been measured using gas chromatographic technique.The experimental results confirm thatβ-CD molecule can form hostguest adduct with adsorbate molecule(guest) as it can in aqueous solution and show that when there is a strong intermolecular force between the host and the guest a type of synergistic interaction exists between,the inner cave and some hydroxyl groups of the CD molecule simultaneously with the apolar/hydrophobic and the polar/hydrophilic parts of the guest molecule.The experimental results also show that a phenomenon of mutual compensation between enthalpy and entropy relates closely with molecular recognize and the sum of the absolute values of adsorption enthalpy and entropy could be considered as a criterion to differentiate intermolecular force of the recognize.

Key words: Molecular recognize, Beta cyclodextrin, Enthalpy, Entropy, Criterion