【摘要】 <正> 对于糖淀粉(CMA)及环糊精(CD)与各种受物形成的包结络合物,其本质是非极性键合,即受物分子离开极性较大的体相,进入极性较小的宿主内穴,这种体相与内穴中极性的差异在很大程度上决定了宿主-受物包结络合物的稳定性.同时,宿主内穴所提供的低极性微环境也直接影响到内穴中受物的反应性.因此,对宿主内穴特性的研究是非常重要的.Bender曾通过脱酸反应速度的改变测得 CD 内穴的介电常数相当于二氧六环.我们也曾报道用更多还原

【Abstract】 Merocyanine dyes with N-butyl and N-decyl as well as the original N-methyl groupcan be used as polarity probes.This paper reported the results about the interaction be-tween such dyes and β-cyclodextrin(β-CD),amylose and CMA in aqueous solution.Forβ-CD inclusion complexes are formed from all of three dyes with a red shift of π-π~* absorp-tion.However only the N-decyl dye interact with amylose and CMA,these resultsagreed with the conclusion that amylose and CMA only included the substrates with ahydrophobic chain which is longer than decyl based on the previous kinetic and otherresults.Spectral data show that in all included cases the chromophore of dyes are not locatedin an environment with enough hydrophobicity,it might be caused by the ionization ofpyridine ring due to the high dipole moment of merocyanine in excited states.更多还原