J-aggregate structure in a chloroform solvate of a 2,3-dicyanopyrazine dye - Separation of two-dimensional stacking dye layers by solvate formation

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• 作者：Shinya Matsumoto ; Emi Horiguchi-Babamoto ; Ryohei Eto ; Saori Sato ; Takashi Kobayashi ; Hiroyoshi Naito ; Motoo Shiro ; Hiromi Takahashi
• 关键词：J-aggregates ; Pyrazine dye ; Chloroform solvate ; Red fluorescence ; Exciton interaction ; Crystal engineering
• 刊名：Dyes and Pigments
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：95
• 期：2
• 页码：431-435
• 全文大小：764 K

文摘

Here, we report the J-aggregate structure of a chloroform solvate of 5-t-butyl-2,3-dicyano-6-[4-(dimethylamino)styryl]-pyrazine with a strong intramolecular charge transfer system. The dye was found to form a two-dimensional brick-wall structure separated by chloroform molecules in the solvated crystals, which exhibited intense red fluorescence. The absorption maximum of the solvate was also found to show a bathochromic spectral shift. These observed optical characteristics were interpreted in terms of excitonic intermolecular interaction based on two-dimensional brick-wall structure which is one of the proposed structures for J-aggregates.