Hydrogen bonding elements, pi - hole functional moieties and C(3)v tripodal scaffold controlled turn-on cyanide and turn-off azide selective receptors

摘要

Here in, we are reporting electron deficient amide and sulfonamide based tripodal receptors L, L-1,L-2 and L-3. Systematic studies show a strong selectivity towards cyanide and azide anions. Detailed UV-Visible and fluorescent spectrometric investigation shows the amide based tripodal receptors Land L-3 acts as a colori metric and turn-on fluorescent chemo-sensor for cyanide, and the sulfonamide based tripodal receptors L-1 and L-2 acts as a colorirnetric and turn-off fluorescent chemo-sensor for azide. At the end we have successfully prepared tripodal receptors for a particular anion with judicious choice of recognition elements such as hydrogen bonding amide/sulfonamide moiety, electron deficient pentafluorophenyl functionality for anion-pi interaction and the well defined C(3)v symmetric tripodal backbone for perfect recognition. (C) 2019 Elsevier B.V. All rights reserved.