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首页> 外文期刊>Journal of Imaging Science and Technology >Aggregation Behavior of Benzoxazole Cyanine Dyes
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Aggregation Behavior of Benzoxazole Cyanine Dyes

机译：苯并恶唑花菁染料的聚集行为

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摘要

The aggregation behavior of the benzoxazole cyanine dye 5-phenyl-3-sulfobutyl-2-{1-[2-ethyl- 3-(5-phenyl-3-sulfobutyl-2-ben-zoxazolediyl)-propenyl]}benzoxazole (GS11), in Langmuir-Blodgett (LB) monolayers and multilayers and in solution has been investigated by UV-visible absorption spectroscopy. The J-aggregates were prepared by two methods. One comprises cospreading the cyanine dye with arachidic acid on a water surface and compressing the layer (spreading method). The other method comprises adsorbing the cyanine dye molecules onto an arachidic acid monolayer from a subphase composed of the dye solution (adsorption method). LB films prepared by both methods showed the characteristic J-band of GS11 at λ = 550 nm, whereas the absorption spectrum of the spreading solution did not. Decreasing intensities and shifts of the J-band toward lower wavelengths were observed in mixtures of methanol/water as the methanol content increased from 0 to 30%. This finding points to a shift of the aggregate equilibrium toward the monomeric form of the dye with decreasing water concentration. Between 30 and 40% methanol content J-bands appeared only when an electrolyte (KCl) was added, and no J-band was observed when the methanol content was below 40%, not even when the solution was saturated with KCl.
机译：苯并恶唑花菁染料5-苯基-3-磺基丁基-2- {1- [2-乙基-3-（5-苯基-3-磺基丁基-2-苯并恶唑二基）-丙烯基]}苯并恶唑（GS11）的聚集行为），在Langmuir-Blodgett（LB）的单层和多层以及溶液中，已通过UV-可见吸收光谱法进行了研究。 J-聚集体通过两种方法制备。一种方法是将花青染料与花生酸共同铺展在水面上，然后压缩该层（铺展方法）。另一种方法包括将花青染料分子从由染料溶液组成的亚相吸附到花生酸单层上（吸附法）。两种方法制备的LB膜在λ= 550 nm处均表现出GS11的特征性J带，而扩散液的吸收光谱则没有。随着甲醇含量从0％增加到30％，在甲醇/水的混合物中观察到J波段的强度降低和向更低波长的移动。这一发现表明随着水浓度的降低，聚集平衡朝着染料的单体形式转移。仅当添加电解质（KCl）时，甲醇含量在30％到40％之间出现J带，而当甲醇含量低于40％时，甚至当溶液被KCl饱和时，都没有观察到J带。

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