Molecular recognition studies on supramolecular systems (XXIV) --Conformations and complexation abilities of chemically

Circular dichroism spectral and fluorescence decay methods have been employed to determine the conformations of mono[6-(p-tolylseleno)-6-deoxy]-β-CD(1), mono(6-anilino-6-deoxy) -β-CD (2) and mono[6-(L-tryptophan)-6-deoxy]-β -CD (3) in phosphate buffer solution (pH 7.2, 0.1 mol dm-3) at 298.15 K. The results indicate that compounds 2 and 3 formed self-inclusion complexes in aqueous buffer solution, while the substituent of compound 1 was not included into cyclodextrin cavity at all. Furthermore, the complex stability constant (logKs) and Gibbs free energy change (-△G °) of these three cylcodextrin derivatives with several cycloalkanols have been determined by circular dichroism spectral titration in phosphate buffer solution at 298.15 K. It is found that the location of the substituent affects the stability of host-guest complex in aqueous solution.

作 者： LIU Yu YOU Changcheng   作者單位： Department of Chemistry, Nankai University, Tianjin 300071, China  刊 名： 中國科學(xué)B輯（英文版）  EI SCI 英文刊名： SCIENCE IN CHINA(SERIES B)  年，卷(期)： 2000 43(1)  分類號(hào)： O6  關(guān)鍵詞： chemically modified cyclodextrin   circular dichroism   fluorescence lifetime   molecular recognition  

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