Synthesis, optical characterization, and electrochemical properties of isomeric tetraphenylbenzodifurans containing electron acceptor groups

Santos-Pérez J.; Crespo-Hernández C.E.; Reichardt C.; Cabrera C.R.; Feliciano-Ramos I.; Arroyo-Ramírez L.; Meador M.A.

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Synthesis, optical characterization, and electrochemical properties of isomeric tetraphenylbenzodifurans containing electron acceptor groups

机译：含电子受体基团的四苯基苯并二呋喃异构体的合成，光学表征和电化学性质

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Isomeric tetraphenylbenzodifuran systems, benzo[1,2-b:5,4]difuran and benzo[1,2-b:4,5]difuran, containing electron acceptor groups (CF_3, CN, and NO_2) have been synthesized and studied. Their electronic absorption, fluorescence, two-photon absorption cross sections, and electrochemical properties were investigated. The absorption and emission maxima are red-shifted for the linear-conjugated systems in comparison with the corresponding isomer. Dual fluorescence was observed and the existence of a twisted intramolecular charge transfer state was confirmed by low-temperature emission experiments. Wide HOMO LUMO energy gaps were obtained ranging from 2.53 to 3.28 eV. HOMO levels were found in the energy range of -6.03 to -6.63 eV while LUMO are within -2.55 to -3.52 eV.

机译：合成并研究了含电子受体基团（CF_3，CN和NO_2）的同构四苯基苯并二呋喃系统，苯并[1,2-b：5,4]二呋喃和苯并[1,2-b：4,5]二呋喃。研究了它们的电子吸收，荧光，两光子吸收截面和电化学性质。与相应的异构体相比，线性共轭体系的吸收和发射最大值发生红移。观察到双重荧光，并且通过低温发射实验确认了扭曲的分子内电荷转移状态的存在。获得了2.53至3.28 eV的宽HOMO LUMO能隙。发现HOMO能级在-6.03至-6.63eV的能量范围内，而LUMO在-2.55至-3.52eV的范围内。

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2011年第17期|共12页
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Santos-Pérez J.; Crespo-Hernández C.E.; Reichardt C.; Cabrera C.R.; Feliciano-Ramos I.; Arroyo-Ramírez L.; Meador M.A.;
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Synthesis, optical characterization, and electrochemical properties of isomeric tetraphenylbenzodifurans containing electron acceptor groups

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