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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Molecular Recognition and Complexation Thermodynamics of Dye Guest Molecules by Modified Cyclodextrins and Calixarenesulfonates
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Molecular Recognition and Complexation Thermodynamics of Dye Guest Molecules by Modified Cyclodextrins and Calixarenesulfonates

机译：修饰的环糊精和杯芳烃磺酸盐对染料客体分子的分子识别和络合热力学

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摘要

The inclusion complexation behavior of some dye guest molecules with two kinds of molecular receptors, i.e., native α-,β-, and γ-cyclodextrins, and chemically modified β-cyclodextrins, and water-soluble calix[n]arenesulfonates (n = 4, 6, 8) and their lower rim alkylated derivatives, has been investigated. It was found that the fluorescence intensity of guest molecules evidently changes upon the addition of molecular receptors. The calix[n]arenesulfonates (n = 4, 6, 8) cause gradual decreases in the fluorescence intensity, whereas native α-, β-, and γ-cyclodextrins cause gradual increases in the fluorescence intensity. Interestingly, the fluorescence intensity of dye guest molecules gradually increases upon the addition of the lower rim alkylated calix[n]arenesulfonate derivatives (n = 4, 6, 8), in contrast to their parent calix[n]arenesulfonates (n = 4, 6, 8). Meanwhile, chemically modified cyclodextrins still show the same effect on the fluorescence intensity of dye guest molecules; however, the hydrophobicity or hydrophilicity of the substituent group influences the increment in the fluorescence intensity. The fluorescence phenomena are explained in terms of photophysical behavior on the basis of the changes in the fluorescence quantum yield and the molecular extinction coefficient of the guests due to the complexation with the two molecular receptors, i.e., cyclodextrins and calixarenesulfonates. The stability constants of the resulting complexes are determined via spectrofluorometric titration. The molecular recognition behavior is discussed from the viewpoint of size/shape-fit, electrostatic interaction, hydrogenbonding, hydrophobic interactions, etc. The thermodynamic parameters for the inclusion complexation of guest molecules with the two kinds of molecular receptors were determined through van't Hoff analysis. The complexation mechanism is also discussed from the thermodynamic viewpoint.
机译：一些染料客体分子与两种分子受体（天然α-，β-和γ-环糊精，化学修饰的β-环糊精和水溶性杯芳烃[n]芳烃磺酸盐（n = 4）的包合络合行为，6、8）及其低级烷基化衍生物已得到研究。发现客体分子的荧光强度在添加分子受体后明显改变。杯[n]芳烃磺酸盐（n = 4、6、8）导致荧光强度逐渐降低，而天然的α-，β-和γ-环糊精导致荧光强度逐渐提高。有趣的是，与它们的母体杯[n]芳烃磺酸盐（n = 4）不同，加入较低边缘烷基化杯[n]芳烃磺酸盐衍生物（n = 4，6，8）时，染料客体分子的荧光强度逐渐增加。 6、8）。同时，化学修饰的环糊精对染料客体分子的荧光强度仍显示相同的作用。然而，取代基的疏水性或亲水性影响荧光强度的增加。根据与两个分子受体，即环糊精和杯芳烃磺酸盐络合的客体的荧光量子产率和分子消光系数的变化，根据光物理行为来解释荧光现象。所得络合物的稳定性常数通过荧光荧光滴定法测定。从尺寸/形状适合，静电相互作用，氢键，疏水相互作用等角度讨论了分子识别行为。通过van't Hoff确定了客体分子与两种分子受体的包合复合物的热力学参数。分析。还从热力学角度讨论了络合机理。

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