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Citation: Zheng Xiao-Ming, Lu Wei-Min, Sun De-Zhi. Enthalpy and Entropy Criterion for the Molecular Recognize of Some Organic Compounds with Beta Cyclodextrin[J]. Acta Physico-Chimica Sinica, ;2001, 17(04): 343-347. doi: 10.3866/PKU.WHXB20010413 shu

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

1.
Institute of Catalysis,Xixi Campus,Zhejiang University,Hangzhou　310028;Department of Chemistry,Liaocheng Teachers′College,Liaocheng　252059

Received Date: 15 September 2000
Available Online: 15 April 2001

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.
- Molecular recognize;Beta cyclodextrin;Enthalpy;Entropy;Criterion
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