Abstract

The structures of J-aggregates of two monomethine dyes are compared at the meso- and nanoscale by using fluorescence and atomic force microscopy. The J-aggregates of the two dyes are found to have solely a monolayer structure and to be polymorphic. Morphologically, monolayers represent narrow skew-symmetric strips and symmetric rhombi in the case of the first and the second dyes. The second morphological type is the tubular type in both cases. For monolayers of both dyes, atomic force microscopy imaging at the ultimate resolution reveals the presence of a quasi-one-dimensional substructure consisting of densely packed nanostrips with a width in the range of 7–10 nm. The nanostrips are interpreted as building blocks emerging at early stages of monolayer crystallization that proceeds via a nonclassical multistep mechanism.

中文翻译：

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两种单甲炔花青染料的单层 J-聚集体在介观和纳米尺度的多晶型结构

摘要

通过使用荧光和原子力显微镜，在介观和纳米尺度上比较了两种单次甲基染料的J聚集体的结构。该Ĵ发现两种染料的聚集体仅具有单层结构并且是多晶型的。在形态上，在第一种和第二种染料的情况下，单层代表窄的斜对称条带和对称菱形。在这两种情况下，第二种形态类型都是管状类型。对于两种染料的单层，最终分辨率的原子力显微镜成像揭示了准一维子结构的存在，该子结构由宽度在 7-10 nm 范围内的密集纳米带组成。纳米带被解释为在单层结晶的早期阶段出现的构建块，通过非经典的多步机制进行。