含四硫富瓦烯结构单元的硫脲类阴离子受体的多重传感识别

series thiourea/urea-based anion receptors functionalized with tetrathiafulvalene (1-4) were prepared. Among them, 4 displays the high sensitive multisensing for acetate anion over various anions in acetonitrile with dramatic changes in UV-vis spectra , cyclic voltammogram and 1H NMR spectra. Conformation change induced by anion complexing of 4 caused the improvement of ICT channel to enhance the charge transfer not noly from thiourea moiety but also from TTF unit to electron-defect benzene ring. TTF unit plays a synergic charge transfer role for trifluoromethyl group in the ICT process. DFT calculation supported the hypothesis of conformational change and ICT channel improvement.