Alkyl substituent effects on J- or H-aggregate formation of bisazomethine dyes
Alkyl substituent effects on J- or H-aggregate formation of bisazomethine dyes
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DOI：
10.1016/j.dyepig.2011.05.024
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发表时间：
2012
影响因子：
4.5
通讯作者：
K. Kinashi;Kyun-Phyo Lee;S. Matsumoto;K. Ishida;Y. Ueda
中科院分区：
文献类型：
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作者：
K. Kinashi;Kyun-Phyo Lee;S. Matsumoto;K. Ishida;Y. Ueda
合成了不同链长的端烷基取代的双甲亚胺染料(BAR：R=1，2，3，4，5和6)，并沉积在玻璃基片上，研究了烷基链长对聚集体形成的影响。甲基和乙基取代的双甲亚胺染料(BA1和Ba2)在薄膜中形成J-聚集体(约50 nm)，而丙基、丁基、戊基和己基取代的衍生物(Ba3，BA4，BA5和BA6)在薄膜中形成H-聚集体(约50 nm)。在乙基和丙基取代基(Ba2/Ba3)之间，棒材的聚集形成发生了很大的变化。然而，Ba2和Ba3薄膜的表面形貌没有明显的变化。结果表明，BAR聚集体形成的关键决定因素是膜中的分子堆积，它取决于末端烷基取代基链的长度。
Bisazomethine dyes with terminal alkyl substituents of different chain lengths (BAR: R = 1, 2, 3, 4, 5 and 6) were synthesized and deposited on a glass substrate to investigate the effect of the alkyl chain length on aggregate formation. Methyl- and ethyl-substituted bisazomethine dyes (BA1 and BA2) formed J-aggregates in thin films (ca. 50 nm), whereas, propyl-, butyl-, pentyl- and hexyl-substituted derivatives (BA3, BA4, BA5 and BA6) formed H-aggregates in thin films (ca. 50 nm). The aggregate formation of the BARs changed drastically between ethyl- and propyl-substituents (BA2/BA3). However, no remarkable changes were observed in the surface morphologies of BA2 and BA3 films. It is suggested that the critical determinant of aggregate formation of BAR is the molecular packing in the film, which depends on the chain length of the terminal alkyl substituent.