Syntheses and photophysical properties of fluorescent dibenzofurans, a dibenzothiophene, and carbazoles substituted with benzoxazole and hydroxyl groups to produce excited state intramolecular proton-transfer
作者:Joel M. Kauffman、Peter T. Litak、Walter J. Boyko
DOI:10.1002/jhet.5570320523
日期:1995.9
Dibenzofurans, a dibenzothiophene, and carbazoles, each substituted with a 2-benzoxazolyl group as well as an ortho-hydroxyl group, were synthesized to produce fluors with fluorescence due to excited-state intramolecular proton-transfer. The orientations for Friedel-Crafts acylation of 3-methoxydibenzothio-phene and of the analogous carbazole were determined. The fluors displayed absorption peaks in
合成了各自被2-苯并恶唑基以及邻羟基取代的二苯并呋喃,二苯并噻吩和咔唑,以由于激发态分子内质子转移而产生具有荧光的荧光。确定了3-甲氧基二苯并噻吩和类似咔唑的Friedel-Crafts酰化的取向。荧光显示出在330-385 nm区域的吸收峰,摩尔消光系数高达57,000。在波长为540-600 nm的波长处获得的荧光量子效率为0.17-0.44。氟有可能在闪烁聚苯乙烯纤维中用作波长转换剂。