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Aggregation of Dyes

机译：染料聚集

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摘要

The photophysics of dyes depend largely on the nature of the dyes as to whether it exists in the monomeric form or in the form of aggregates originating from the self-association of dyes in solution or at the solid-liquid interface which is a frequently encountered phenomenon in dye chemistry. The property of molecular association of dyes, in addition to the molecular structure, depends on the concentration and viscosity of the solutions, and temperature besides the other usual properties of solutions. Owing to strong intermolecular van der Waals-like attractive forces between the molecules. The aggregates in solution exhibit distinct changes in the absorption band as compared to the monomeric species. From the spectral shifts, various aggregation patterns of the dyes in different media have been proposed. The bathochromically shifted (or red shifted) J-bands (J for Jelly, one of the first workers who investigated these shifts) and hypsochromically shifted (or blue shifted) H-bands (H for hypsochromic) of the aggregates have been explained in terms of molecular exciton coupling theory, i.e., coupling of transition moments of the constituent dye molecules. The aggregates that exhibit J-bands in their absorption spectrum are called J aggregates and H aggregates exhibit these H bands.
机译：染料的光物理性质在很大程度上取决于染料的性质，即染料是以单体形式还是以染料在溶液中或在固液界面处自缔合而形成的聚集体形式存在，这是一种经常遇到的现象在染料化学中。除分子结构外，染料分子缔合的性质还取决于溶液的浓度和粘度，以及溶液的其他常规性质，还取决于温度。由于分子之间的强分子间范德华力。与单体物质相比，溶液中的聚集体在吸收带上表现出明显的变化。从光谱偏移，已经提出了染料在不同介质中的各种聚集模式。聚集体的红移（或红移）的J波段（Jelly为J，是研究这些偏移的第一批工作人员）和聚集体的红移（或蓝移的）H波段（H为蓝移）已用术语解释。分子激子偶合理论，即组成染料分子的跃迁矩的耦合。在其吸收光谱中表现出J带的聚集体被称为J聚集体，而H聚集体表现出这些H带。

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  • 来源
    《Colourage》 |2015年第1期|5456|共2页
  • 作者

    N.Sekar;

  • 作者单位

    Dyes Department Institute of Chemical Technology Matunga, Mumbai 400019;

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