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。
A Highly Sensitive ESIPT-Based Ratiometric Fluorescence Sensor for Selective Detection of Al<sup>3+</sup>
intramolecular proton transfer (ESIPT)-based highly sensitive ratiometric fluorescencesensor, 1H was developed for selectivedetection of aluminum (Al3+) in acetonitrile as well as in 90% aqueous system. Single-crystal X-ray diffraction analysis reveals almost planar and conjugated structure of 1H. Photophysical properties of the sensor as well as its selectivity toward Al3+ are explored using UV–visible
Reactions of Phenanthraquinone and Retenequinone with Aldehydes and Ammonium Acetate in Acetic Acid Solution<sup>1</sup>
作者:Edgar A. Steck、Allan R. Day
DOI:10.1021/ja01243a043
日期:1943.3
XXIII.—On the action of aldehydes on phenanthraquinone in presence of ammonia. (Third notice.)
作者:Francis R. Japp、Fredk W. Streatfeild
DOI:10.1039/ct8824100146
日期:——
Ruthenium(II)-Catalyzed Sequential C–H/N–H Alkene Annulation Cascade of Phenanthroimidazoles: Synthesis and Photophysical Studies
作者:Rekha Thakur、Kamaldeep Paul
DOI:10.1021/acs.joc.3c02947
日期:——
We report ruthenium(II)-catalyzed sequential C–H/N–H alkenylation cascade of phenanthroimidazole and alkenes to form novel phenanthroimidazoisoindol acrylates via dual C–Hactivation and aza-Michael reaction. The two nitrogen atoms of the imidazole ring act as directing groups for regioselective dual sequential ortho C–Hactivation. These polycyclic N-heterocycles were evaluated for their photophysical