摘要
用荧光和紫外光谱滴定技术分别测定了 β-环糊精 ( 1 )、单 -[6 -(乙二胺基 ) -6 -脱氧 ]-β-环糊精 ( 2 )、单 -[6 -(二乙烯三胺基 ) -6 -脱氧 ]-β-环糊精 ( 3)、单 -[6 -(三乙烯四胺基 ) -6 -脱氧 ]-β-环糊精 ( 4 )及其相应的铜配合物 ( 5 ,6 ,7)在 2 5℃时 ,p H为 7.2和 2 .0的缓冲溶液中 ,与几种染料分子作为模型底物形成超分子配合物的稳定常数 .结果表明 ,环糊精和修饰环糊精均使客体 Rh B的荧光强度下降 ,而使其它客体分子的荧光强度增强 .与母体环糊精相比 ,铜键合修饰 β-环糊精和修饰环糊精质子化可以增强主客体间的静电相互作用 ,从而提高对一些底物的键合能力 .从主客体间的尺寸与形状关系讨论了主体 ( 1～ 7)对染料分子识别的机理 .
The spectrophotometric and spectrofluorometric titrations have been performed to give the stability constants for the supramolecular systems formed by β-cyclodextrin(1), mono [6-(ethylenediamine)-6-dexoy]-β-cyclodextrin(2), mono[6-(diethylenetriamino)-6-dexoy]-β-cyclodextrin(3), mono [6-(triethylenetetraamino)-6-dexoy]-β-cyclodextrin(4) and their copper(Ⅱ) complexes(5, 6, 7) with some dyes in phosphate buffer solution(pH 7.2, 0.1 mol/L) and hydrochloric acid-potassium chloride buffer solution(pH 2.0, 0.1 mol/L) at 25 ℃. The results obtained indicated that the fluorescence intensity of RhB decreased with increasing concentration of native β-CD(1) and its derivatives(2-7), while the fluorescence intensity of other vip molecules simply increased with increasing concentration of host compounds. As compared with parent β-cyclodextrin, the stability constants of the formed inclusion complexes by copper(Ⅱ) complexes of polyamine modified β-cyclodextrins and protonated polyamine modified β-cyclodextrins were found to be increased by electrostatic interaction. The molecular recognition mechanism is discussed from the viewpoint of the size/shape matching between vip molecular structures and host cavity
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第12期2272-2277,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :2 9972 0 2 9)资助
