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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Investigation of Tetramethylenesulfonated Calix[4]resorcinarene Interactions with Azo Dyes in Aqueous Solution
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Investigation of Tetramethylenesulfonated Calix[4]resorcinarene Interactions with Azo Dyes in Aqueous Solution

机译：四亚甲基磺化杯[4]间苯二芳烃与偶氮染料在水溶液中的相互作用的研究

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摘要

The interaction of a macrocycle's aggregates with a guest molecule has special interest due to the double role, both of macrocycle cavity and self-associates, in the binding of the guests. Here, we report on the interactions of nonaggregated methyl-substituted (SCA1) and aggregated penthyl-substituted (SCA2) tetramethylenesulfonated calix[4]resorcinarenes with pH indicators methyl yellow (MY) and methyl orange (MO) in aqueous solutions. It was found that the pH of aqueous solutions of SCA1 and SCA2 depends on their concentration: besides, variation of the concentration of SCA1 and SCA2 results in a shift of the absorption maxima and of pH-sensitive azo dyes. Association of the marocycles with azo dyes was demonstrated to follow a proton-transfer mechanism accompanied by protonation of the dyes; it was found that excess of the macrocycle in solution with the universal buffer background shifts the pK_A values and stabilizes the protonated form of the dyes. Consideration of interactions of small dye molecules with large molecular associates, containing both individual and multimolecule binding sites, gives a closer approximation of synthetic biomimetics to their natural prototypes.
机译：大环聚集体与客体分子的相互作用特别受关注，因为大环腔和自缔合在客体结合中都起着双重作用。在这里，我们报告了水溶液中pH指示剂甲基黄（MY）和甲基橙（MO）的非聚集甲基取代（SCA1）和聚集戊基取代（SCA2）的四亚甲基磺化杯[4]间苯二芳烃的相互作用。发现SCA1和SCA2水溶液的pH取决于它们的浓度：此外，SCA1和SCA2浓度的变化会导致最大吸收率和pH敏感的偶氮染料的移动。证明了大环摩托车与偶氮染料的结合遵循质子转移机制并伴随染料的质子化。已经发现，具有通用缓冲液背景的溶液中过量的大环化合物会移动pK_A值并稳定染料的质子化形式。考虑到小染料分子与大分子缔合体（包含单个和多分子结合位点）之间的相互作用，可以使合成的仿生物模拟物更接近其天然原型。

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