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.
Donor–acceptor molecules containing thiophene chromophore: synthesis, spectroscopic study and electrogenerated chemiluminescence
摘要:
Donor-acceptor molecules containing thiophene chromophore with remarkably large Stokes shift (> 210 nm) have been found to exhibit strong and stable ECL emission via the singlet excited state without the addition of any co-reactant or a second compound. (c) 2006 Elsevier Ltd. All rights reserved.
comprises an antimuscarinic drug and an oxime reactivator of the inhibited enzyme. Oximes in use have quaternary nitrogens, and therefore poorly cross the brain–blood barrier. In this work, we synthesized novel uncharged thienostilbene oximes by the Wittig reaction, converted to aldehydes by Vilsmeier formylation, and transformed to the corresponding uncharged oximes in very high yields. Eight trans,anti-
Linear and Nonlinear Optical Properties of Diiron μ-Vinylcarbyne Acceptor and Stilbenyl Donor Based Chromophores
作者:Tony Farrell、Timo Meyer-Friedrichsen、Jürgen Heck、Anthony R. Manning
DOI:10.1021/om000112z
日期:2000.8.1
Ionic [(CpFeCO)2(μ-CO)(μ-CCHCH−)]+ fragments were used as electron acceptors in combination with para-substituted stilbenyl donors to form push−pull chromophores. These μ-vinylcarbyne salts were prepared by two complementary procedures: (a) the direct condensation of the μ-ethylidyne complex [(CpFeCO)2(μ-CO)(μ-CCH3)][BF4] with various stilbenyl aldehydes and (b) the preparation and reaction of the