- Photophysical study of 5-substituted benzofurazan compounds as fluorogenic probes
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Nine 5-substituted benzofurazans including the non-substituted benzofurazan were synthesized, and measurements of the fluorescence, photolysis, transient absorption, and time-resolved thermal lensing signal were performed in order to understand the relaxation processes of these compounds. The results indicated that the main relaxation process was a photoreaction from an excited singlet state and the rate of the primary bond cleavage in the excited state tended to increase in the compound in which the S2←S0 absorption band is located close to the S1←S0 absorption band. These results suggest that the reactive state might be the S2 state, and that the interaction between the S1 and S2 states promotes the photoreaction. The separation of the S1 state from the S2 state decreases the rate of photoreaction, resulting in an increase in the Φf values. The Φf values of the 5-substituted benzofurazans in cyclohexane and acetonitrile were compared with their ΔE(S1, S2) (energy gap between the S1 and S2 states) values calculated by using a combination of AM1(EXCITED) and AM1-CAS/ CI(CI = 6) for geometric optimization and calculation of the energy levels, respectively. The ΔE(S1, S2) values correlated well with the Φf values in each solvent, thus enabling us to predict the fluorescence properties of the 5-substituted benzofurazans based on their chemical structures.
- Uchiyama, Seiichi,Takehira, Kazuyuki,Kohtani, Shigeru,Santa, Tomofumi,Nakagaki, Ryoichi,Tobita, Seiji,Imai, Kazuhiro
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- Revisiting the Synthesis of 4,6-Difluorobenzofuroxan: A Study of Its Reactivity and Access to Fluorinated Quinoxaline Oxides
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New quinoxaline 1,4-dioxide derivatives have been synthesized from novel fluorinated benzofuroxans such as 4-fluorobenzofuroxan, which is prepared for the first time. Furthermore, the preparation 4,6-difluorobenzofuroxan has been revisited because we were
- Jovené, Cyril,Jacquet, Morgane,Marrot, Jérome,Bourdreux, Flavien,Kletsky, Mikhail E.,Burov, Oleg N.,Gon?alves, Anne-Marie,Goumont, Régis
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- Cu-Catalyzed π-Core Evolution of Benzoxadiazoles with Diaryliodonium Salts for Regioselective Synthesis of Phenazine Scaffolds
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The Cu-catalyzed regioselective synthesis of phenazine N-oxides was realized from benzoxadiazoles and diaryliodonium salts. The process was initiated by the electrophilic arylation of benzoxadiazoles with diaryliodonium salts and followed by benzocyclization reactions. The further reduction of N-oxides in situ to phenazine scaffolds and deviation to organic fluorescent materials were readily accomplished.
- Sheng, Jinyu,He, Ru,Xue, Jie,Wu, Chao,Qiao, Juan,Chen, Chao
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p. 4458 - 4461
(2018/08/09)
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- FLUORINATED BENZOXADIAZOLE-BASED DONOR-ACCEPTOR POLYMERS FOR ELECTRONIC AND PHOTONIC APPLICATIONS
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A polymer comprising a repeating unit, which may further comprise one or more repeating units. The present subject matter also relates to a formulation comprising the polymer, and a fullerene, second polymer, or small molecule. The present subject matter further relates to an organic electronic (OE) device comprising a coating or printing ink containing the formulation, where the OE device may be an organic field effect transistor (OFET) device or an organic photovoltaic (OPV) device. The present subject matter also relates to synthesis of monomers, polymers, and the compounds produced therein.
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Paragraph 131; 134; 135
(2017/07/06)
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- Studies on aromatase inhibitors IV. Synthesis and biological evaluation of N,N-disubstituted-5-aminopyramidine derivatives
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In order to study the potency of the 5-aminopyrimidine skeleton as an aromatase inhibitor, we synthesized various N,N-disubstituted-15- aminopyrimidine derivatives and evaluated their aromatase-inhibitory activity (in vitro) and their inhibitory activity
- Okada, Minoru,Yoden, Toru,Kawaminami, Eiji,Shimada, Yoshiaki,Kudoh, Masafumi,Isomura, Yasuo
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p. 1293 - 1299
(2007/10/03)
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