Synthesis and optical properties of 6,10-dihydrofluoreno[2,3-d:6,7-d′]diimidazole derivatives
作者:Hong-Fang Chen、Yong-Mei Cui、Jian-Guang Guo、Hai-Xia Lin
DOI:10.1016/j.dyepig.2012.03.004
日期:2012.9
A series of 10,10-dioctyl-3,6-dihydrofluoreno[2,3-d:6,7-d']diimidazole derivatives were conveniently synthesized by condensation of the key intermediate 2,3,6,7-tetraamino-9,9-dioctylfluorene (TADOF) with aldehydes under very mild conditions. All of the target compounds were characterized using H-1 NMR, C-13 NMR, and elemental analysis. The crystal structure of 3,6-dibenzyl-10,10-dioctyl-2,7-diphenyl-6,10-dihydro-3H-fluoreno[2,3-d:6,7-d']diimidazole was determined as triclinic, space group P-1 type, using single X-ray crystallography. For seventeen samples, UV-visible absorption maximum wavelength (lambda(max)), fluorescence excitation wavelength (lambda(ex)), fluorescence emission wavelength (lambda(em)) and fluorescence quantum yield (phi(FL)) were measured in dilute dichloromethane solution and in the solid state. These compounds possess a medium strong blue fluorescence-emitting ability with phi(FL) values in the region of 0.30-0.89 and structure-optical behavior characteristics were discussed. (C) 2012 Elsevier Ltd. All rights reserved.