摘要
合成了两种新型芴衍生物:2,7-二(3,5-二(三氟甲基)苯基)-9,9-二乙基芴(1)和2,7-二(4-氟苯基)-9,9-二.乙基芴(2).通过元素分析、红外光谱(IR)、核磁共振氢谱(1H NMR)以及单晶X射线衍射对其结构进行了表征.化合物1属于单斜晶系,P21/c空间群;化合物2属于三斜晶系,P-1空间群.通过紫外-可见吸收和荧光光谱研究了化合物的发光性能.结果表明:在CH2Cl2溶液和固态薄膜中,化合物1、2在350 ～400nm波段有吸收峰,归属于π-π*电荷跃迁;化合物1、2的光学带隙Eg分别为3.31 eV和3.30eV,并且均有强烈的蓝色荧光发射现象(激发波长为330 nm),在二氯甲烷中的荧光量子效率分别为0.62和0.61,固态荧光寿命分别为6.39 ns和9.00 ns.
Two new types of fluorene derivatives, 2, 7-bis(3, 5-bis(trifluoromethyl)phenyl)-9, 9-diethyl fluorene (C33H22F12, Mr=646.51, compound 1) and 2, 7-bis(4-fluorophenyl) -9, 9-diethyl fluorene (C29H24F2, Mr=410.48, compound 2) were synthesized and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. Compound 1 belonged to monoclinic crystal system, space group P21/c, and compound 2 was of triclinic with space group P-1. Their optoelectric properties were measured by UV-Vis absorption spectra and fluorescence spectra. The results show that compound 1 and 2 have low-energy absorption bands ranging from 350 nm to 400 nm in dichloromethane solution or solid film, which can be assigned to the π-π* charge transfer transitions. The optical band gaps (Eg) of 1 and 2 are estimated to be 3.31 eV and 3.30 eV, respectively. The title compounds exhibite strong blue photoluminescence under 330 nm excitation at room temperature. The fluorescence quantum yields in CH2Cl2 of compound 1 and 2 are 0.62 and 0.61, and solid-state lifetimes are 6.39 ns and 9.00 ns, respectively.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2014年第2期156-164,共9页
Chinese Journal of Luminescence
基金
国家自然科学基金(20971075)
浙江省自然科学基金(LY12B01005)
宁波大学王宽诚幸福基金资助项目
关键词
芴衍生物
合成
晶体结构
薄膜
光谱性能
Crystal structure
Dichloromethane
Films
Synthesis (chemical)
Ultraviolet spectroscopy
X ray diffraction
