Fluorescence of Diimidazo[1,2-a:2′,1′-c]quinoxalinium Salts Under Various Conditions
摘要:
The synthesis and photophysical properties of diimidazo[1,2-a:2',1'-c]quinoxalinium salts were examined for different counteranions. The ethyl-substituted diimidazo[1,2-a:2',1'-c]quinoxalinium salt with tosylate anion (categolized in ionic liquid) showed good fluorescence (Phi(F) = 0.77) in organic solvent. The 3,10-diphenyldiimidazo[1,2-a:2',1'-c]quinoxalinium salts showed absorption and fluorescence peaks resembling those of the former diimidazoquinoxaline. The salt also emitted under various conditions such as in organic solvents, water, and even in the solid state, while retaining a good fluorescence quantum yield (Phi(F) = 0.5-0.8). Furthermore, the fluorescence was quenched efficiently through the introduction of an electron-donating substituent on the alkyl side chain.
Reaction of 1,2-di(imidazolyl)benzene treated with n-BuLi proceeded to give diimidazo[1,2-a:2′,1′-c]quinoxaline in the presence of iodine or Pd(PPh3)4. Blue fluorescence was observed from 3,10-diarylated diimidazoquinoxalines with high quantum yield. They were also applied to organic light-emitting devices as emitters, in which the diphenyl derivative emits a nearly pure blue light.
的反应 1,2-二(咪唑基)苯在碘或Pd(PPh 3)4存在下,用n- BuLi处理的化合物继续生成二咪唑并[1,2- a:2',1'- c ]喹喔啉。从3,10-二芳基二咪唑并喹喔啉中以高量子产率观察到蓝色荧光。它们还被用作有机发光器件的发光体,其中二苯衍生物发出近乎纯净的蓝光。
METHOD FOR PRODUCING PYRAZOLES, NOVEL PYRAZOLES AND APPLICATIONS THEREOF
申请人:COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
公开号:US20150368295A1
公开(公告)日:2015-12-24
A method for preparing a pyrazole of formula (I) in which R,R′ and R″ have different meanings, characterised in that it involves reacting a sydnone of formula (II) in which R and R′ have the meanings already indicated, with an alkyne of formula (III) in which R″ has the meaning already indicated, in the presence of copper, to obtain a pyrazole compound of formula (I) that is then isolated and salified if desired.