Novel colorimetric anion sensors based on N-acetylglyoxylic amides containing nitrophenyl signalling units
摘要:
N-acetylglyoxylic amides 4 and 5 bearing pendant 4-nitrophenyl and 2,4-dinitrophenyl groups respectively were synthesized and evaluated as anion sensors. A crystal structure of 4 was obtained by X-ray crystallography. Compounds 4 and 5 behaved as calorimetric sensors for CN- and F-, and exhibited naked eye-detectable color changes upon the addition of these anions. The chromogenic properties of 4 and 5 were assessed by UV-Vis and H-1 NMR spectroscopy. (C) 2013 Elsevier B.V. All rights reserved.
anions HSO4−, Cl−, Br− and NO3− as investigated by NMR studies. The receptors formed 1:1 host-guest complexes in solution. X-ray structure of 1 along with TBA that bind a chloride anion is reported. Molecule 1 showed the highest selectivity for HSO4− anion over others measured. X-ray structure of the bound Cl− revealed a pocket containing the anion making strong (N H⋯Cl) and weak hydrogen bonds (C H⋯Cl)
N-acetylglyoxylic amides 4 and 5 bearing pendant 4-nitrophenyl and 2,4-dinitrophenyl groups respectively were synthesized and evaluated as anion sensors. A crystal structure of 4 was obtained by X-ray crystallography. Compounds 4 and 5 behaved as calorimetric sensors for CN- and F-, and exhibited naked eye-detectable color changes upon the addition of these anions. The chromogenic properties of 4 and 5 were assessed by UV-Vis and H-1 NMR spectroscopy. (C) 2013 Elsevier B.V. All rights reserved.