Donor–π-acceptor benzothiazole-derived dyes with an extended heteroaryl-containing conjugated system: synthesis, DFT study and antimicrobial activity
摘要:
A series of novel derivatives containing an electron-donating N,N-dimethylaminophenyl ring connected to an electron-withdrawing benzothiazole or benzothiazolium moiety via a heteroaryl system (furan, thiophene or N-methylpyrrole) and up to two ethenylene groups have been synthesized and characterized. Furthermore, their nonlinear optical (NLO) properties have been investigated at the theoretical level using DFT and time-dependent DFT methods, and their antimicrobial activities were evaluated against a standard set of unicellular organisms. Both benzothiazole and benzothiazolium systems are predicted to exhibit large NLO responses, based on the calculated static molecular quadratic hyper-polarizabilities beta(0) as well as intramolecular charge transfer (ICT) transition characteristics. Moreover, the 3-alkyl-benzothiazolium salts were found to display high toxicity against several tested microbes. (c) 2008 Elsevier Ltd. All rights reserved.
o -Phosphinophenolate 和o -phosphinothiophenolate是有效的光催化剂,具有很强的还原能力,可在可见光下活化芳基氯化物和溴化物,进行硼化、芳基化和磷酸化。实验和理论研究表明,邻二苯基膦取代基会导致窄的光学间隙并促进系统间交叉进入三重态,从而促进酚盐和苯硫酚作为有效的可见光-光氧化还原催化剂发挥作用。本文提出的结果表明合成改性的酚盐和苯硫酚盐作为光氧化还原催化剂的前景广阔。
Potent Reductants via Electron-Primed Photoredox Catalysis: Unlocking Aryl Chlorides for Radical Coupling
作者:Nicholas G. W. Cowper、Colleen P. Chernowsky、Oliver P. Williams、Zachary K. Wickens
DOI:10.1021/jacs.9b12328
日期:2020.2.5
productively engage aryl chlorides with reduction potentials hundreds of millivolts beyond the potential of Na0 in productive radical coupling reactions. The arylradicals produced via this strategy can be leveraged for both carbon-carbon and carbon-heteroatom bond-forming reactions. Through direct comparison, we illustrate the reactivity and selectivity advantages of this approach relative to electrolysis