An efficient triazole-based fluorescent "turn-on" receptor for naked-eye recognition of F- and AcO-: UV-visible, fluorescence and H-1 NMR studies

作者：Kumar M Saravana; Kumar S L Ashok; Sreekanth A^*

来源：Materials Science and Engineering: C , 2013, 33(6): 3346-3352.

DOI：10.1016/j.msec.2013.04.018

• Triazole
• Anions recognition
• Colorimetric
• " Turn-on" fluorescence
• H-1 NMR titration

An efficient colorimetric receptor was developed by a simple convenient method which exhibited naked-eye sensitivity for fluoride and acetate in a biologically competing solvent like DMSO. The receptor developed, portrayed a substantial change in the UV-visible absorption characteristics upon addition of fluoride and acetate anions over other anions. The binding constants showed that the binding ability of receptor towards F- anion was slightly higher than that of the AcO- anion. Job's plots indicated the formation of a (1:1) complex (receptor:anion) of receptor with fluoride and acetate anions respectively. A "turn on" fluorescence response with a red shift was observed upon fluorescence titration. H-1 NMR titration experiments revealed the mechanism to be driven by the hydrogen bonding interaction of amide -NH and phenol - OH of the receptor molecule which was followed by deprotonation in the receptor by the F- and AcO- anions.

• 出版日期2013-8-1