合成了以2-(2-羟苯基)咪唑衍生物为螯合配体的两种新的四配位有机硼化合物。它们具有高的热稳定性,并且能够形成非晶态玻璃态。晶体学分析表明,配体结构的差异引起π⋯π堆积特性的变化。CH 2 Cl 2这些化合物的溶液和薄膜显示出明亮的蓝色发射光,并且这些化合物具有适当的HOMO和LUMO能级,可用于OLED中的载流子注入。通过利用良好的热和发光特性以及适当的前沿轨道能级,已经实现了具有简单结构的明亮的非掺杂OLED。值得注意的是,这些简单的设备显示深蓝色电致发光,且国际照明委员会(CIE)的坐标为ca。(0.16,0.08),接近国家电视系统委员会定义的标准蓝色的CIE坐标(0.14,0.08)。另外,其中一种器件表现出良好的性能,显示出高达2692 cd m -2的亮度,电流效率,功率效率和外部量子效率,2.50光盘-1,1.81流明w ^ -1和分别3.63%。这项研究不仅提供了良好的深
Fluorescence resonance energy transfer from a bio-active imidazole derivative 2-(1-phenyl-1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)phenol to a bioactive indoloquinolizine system
摘要:
Novel donor imidazole derivative, 2-(1-phenyl-1H-imidazo [4,5-f][1,10]phenanthrolin-2-yl)-phenol (PIPP) was screened as highly sensitive chemisensor for transition metal ions and it can be used as a "multi-way" optically switchable material. Solvatochromic effects on the fluorescence behaviour of PIPP were studied in different solvents. The fluorescence of PIPP was highly sensitive to both the polarity as well as protic nature of the solvent. Fluorescence (Forster) resonance energy transfer (FRET) process from PIPP to a potent bioactive indoloquinolizine molecule was studied and it is argued that long-range dipole-dipole interaction is operating for the energy transfer mechanism. The energy transfer efficiency (E) and the distance between the acceptor and the donor (r(0)) have been determined. (C) 2011 Elsevier B.V. All rights reserved.
series of new imidazole derivatives: bis-imidazoles (compounds 1–8), phenyl-substituted 1H-imidazoles (compounds 9–19), and thiopene-imidazoles (compounds 20–26). All these compounds were assessed for in vitro potential to restrict the growth of T. gondii. To explore the structure–activityrelationships, molecular analyses and bioactivity prediction studies were performed using a standard molecular model
Synthesis, characterization and optical properties of aryl and diaryl substituted phenanthroimidazoles
作者:Manoj Kumar Nayak
DOI:10.1016/j.jphotochem.2012.05.018
日期:2012.8
and tosylaminophenyl substituted derivatives of 2-phenyl-1H-phenanthro[9,10-d]imidazole and 1,2-diphenyl-1H-phenanthro[9,10-d]imidazole have been performed to elucidate the origin of the surprisingly divergent emission shifts. Out of these, three dyes (HPhI, HPPhI, and TsPPhI) undergo excitedstate intramolecular protontransfer (ESIPT) reaction leading a large Stokes’ shifted fluorescence emission
本文介绍了一种新型的蓝绿色荧光菲并咪唑类化合物的简便合成方法,并报道了它们的光学,电化学和热学性质。详细的光物理和量子化学研究,用2-苯基-1 H-菲并[9,10 - d ]咪唑和1,2-二苯基-1的一系列羟基,甲氧基,硝基,氨基和甲苯磺酰基氨基苯基取代的衍生物H-菲咯[9,10- d已经进行了对咪唑的研究,以阐明出乎意料的发散位移的起源。其中,三种染料(HPhI,HPPhI和TsPPhI)经历激发态分子内质子转移(ESIPT)反应,导致光互变异构体产生大量的斯托克斯位移荧光。量子化学研究的结果不仅证实了ESIPT互变异构体的分子内电荷转移特性,而且为观察到的固态高荧光量子效率提供了合理的理由。高光致发光量子产率(Φ PL 固态状态下约39–68%)归因于扭曲的发色团,这是由于菲并咪唑环的1,2-位上的苯基取代基限制了分子内的运动,从而导致光学上允许的最低光学跃迁而没有自猝灭。
Bright, emission tunable fluorescent dyes based on imidazole and π-expanded imidazole
作者:Kamil Skonieczny、Adina I. Ciuciu、Eva M. Nichols、Vincent Hugues、Mireille Blanchard-Desce、Lucia Flamigni、Daniel T. Gryko
DOI:10.1039/c2jm33891b
日期:——
A diverse set of imidazole- and Ï-expanded imidazole derivatives displaying excited state intramolecular proton transfer (ESIPT) was designed and synthesized. The effect of structural variation on photophysical properties was studied in detail for nine dyes. The relationship between the structure and photophysical properties was thoroughly elucidated also by comparing with analogues with blocked ESIPT functionality. All but one of the obtained compounds exhibit ESIPT, as demonstrated by large Stokes shifts (6500â15â600 cmâ1). The type of Ï-expansion strongly influences the overall optical phenomena: while typical Ï-expansion preserves ESIPT activity, the direct fusion of imidazole with a naphthalene unit at positions 4 and 5 results in dyes which do not exhibit ESIPT. The compound possessing an acidic NH group as part of an intramolecular hydrogen bond system has a much higher fluorescence quantum yield and Stokes shift than its analogue bearing an OH group. The occurrence of ESIPT for tosylamide analogues is less affected by the hydrogen-bonding ability of the solvents compared to the unprotected amines. Two-photon absorption cross-sections of the selected derivatives are in the range of 5â100 GM.
High-Performance Red, Green, and Blue Electroluminescent Devices Based on Blue Emitters with Small Singlet-Triplet Splitting and Ambipolar Transport Property
作者:Kai Wang、Fangchao Zhao、Chenguang Wang、Shanyong Chen、Dong Chen、Hongyu Zhang、Yu Liu、Dongge Ma、Yue Wang
DOI:10.1002/adfm.201202981
日期:2013.6.6
Zn(PPI)2. An undoped deep‐blue fluorescent organic light‐emitting device (OLED) that uses Be(PPI)2 as emitter exhibits a maximum power efficiency of 2.5 lm W−1 with the CIEcoordinates of (0.15, 0.09), which are very close to the National Television Standards Committee (NTSC) blue standard (CIE: 0.14, 0.08). Green and red phosphorescent OLEDs (PhOLEDs) that use Be(PPI)2 and Zn(PPI)2 as host materials
两个配位配合物发射体以及主体材料Be(PPI)2和Zn(PPI)2(PPI = 2-(1-苯基-1 H-菲[9,10 - d ]咪唑-2-基)苯酚)设计,合成和表征。金属原子的引入导致扭曲的构象和刚性的分子结构,从而改善了具有高T d和T g的Be(PPI)2和Zn(PPI)2的热稳定性。分别在475和217°C左右。给电子的苯酚基团的引入导致发射颜色转移到深蓝色区域,并且发射最大值出现在429 nm附近。这种分子设计策略可确保Be(PPI)2和Zn(PPI)2的最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)HOMO和LUMO定位在分子的不同部分上。因此,这两个配合物具有双极性传输性质,Be(PPI)2的单重态-三重态分裂较小,为0.35 eV,Zn(PPI)2的为0.21 eV 。使用Be(PPI)2的未掺杂深蓝色荧光有机发光器件(OLED)作为发射器,其最大功率效率为2.5