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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Dynamics of Formation of 1,1'-Diethyl-2,2'-Cyanine Iodide J-Aggregates in Solution
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Dynamics of Formation of 1,1'-Diethyl-2,2'-Cyanine Iodide J-Aggregates in Solution

机译：溶液中1,1'-二乙基-2,2'-花青碘化物J-聚集体形成的动力学

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摘要

The dynamics of the formation of 1,1'-diethyl-2,2'-cyanine iodide (PIC) J-aggregates in water solutions have been studied using UV/vis spectroscopy. The appearance and growth of the J-aggregates' band at 573 nm took place simultaneously with the decrease of the absorption of the sample at 525 and 485 nm. The experimental dependence of the intensity of the absorption at 573 nm versus time has the shape of a reverse exponential curve, J_(573) = J_0(1 - exp(-kt)). Two possible explanations of the experimental data are given. The first one is that if J-aggregates are simple chains of molecules, then only three PIC molecules in aggregate may be enough to produce a J-band in the absorption spectrum of the solution. The second one is that J-aggregates are not simple chains of molecules but consist of “unit cells” of nonlinear structure. At a high concentration of PIC the full width at half-maximum of the J-band increased with time, but the position of its maximum did not change. Possible explanations of this phenomenon are discussed.
机译：使用紫外/可见光谱研究了水溶液中1,1'-二乙基-2,2'-碘化氰（PIC）J聚集体的形成动力学。在573 nm处J聚集带的出现和增长与525和485 nm处样品的吸收减少同时发生。 573 nm处的吸收强度随时间变化的实验依赖性具有反指数曲线的形状，即J_（573）= J_0（1- exp（-kt））。给出了实验数据的两种可能的解释。第一个是，如果J聚集体是分子的简单链，则聚集物中只有三个PIC分子可能足以在溶液的吸收光谱中产生J带。第二个是J聚集体不是简单的分子链，而是由非线性结构的“晶胞”组成。在PIC浓度高的情况下，J波段最大半值的全宽度随时间增加，但其最大位置不变。讨论了这种现象的可能解释。

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