标题：Synthesis and photophysical properties of two novel branched pyridinium inner salt dyes
作者：Huihui Chen;Zhiqiang Liu;Duxia Cao
作者机构：[Chen, H] School of Material Science and Engineering, University of Jinan, Jinan 250022, Shandong, China;[ Liu, Z] State Key Laboratory of Crystal Mat 更多
通讯作者地址：[Cao, DX]Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Shandong, Peoples R China.
来源：Dyes and Pigments
关键词：Pyridinium inner salt;Two-photon absorption;Two-photon excited fluorescence;Synthesis;Carbazolyl;Branched structure
摘要：Two new branched pyridinium inner salt dyes, 2,6-di[2-(N-ethyl-carbazole-3-yl)vinyl]-N-(3-sulfonate-propyl)pyridinium, inner salt (2) and 2,4,6-tri[2-(N-ethyl-carbazole-3-yl)vinyl]-N-(3-sulfonatepropyl) pyridinium, inner salt (3), with N-ethyl-carbazolyl as electron donor group and pyridine cation as electron acceptor group have been synthesized. Their single- and two-photon related fluorescence properties in various solvents have also been examined. These dyes exhibit stronger fluorescence emission relative to the corresponding linear counterpart and common pyridinium dyes with discrete cation and anion components. Three-branched organic dye 3 has a high fluorescence quantum yield as 0.12 and exhibits strong orange two-photon excited fluorescence at 608 ran in THF with large two-photon absorption cross-section being 606 GM.