A benzothiazole-based receptor conjugated with an imidazolium cation, receptor N1, was synthesized. Receptor N1 is capable of selectively binding Hg(II) in the presence of other metal ions in water, with a large enhancement in fluorescence intensity at 380 nm via a PET mechanism. The resulting Hg(II) complex of receptor N1 showed a selective ratiometric response upon addition of Br- ions. The Hg(II) complex of receptor N1 was used to determine the concentration of Br- ions in the presence of other anions, with a detection limit of 22 nM. 1H NMR studies showed that the imidazolium hydrogen in the Hg(II) complex of receptor N1 participates in the recognition of Br- ions. In the absence of Hg(II), receptor N1 did not recognize Br- ions.
Bibliographical noteFunding Information:
A.S. is thankful to CSIR-New Delhi, India, for his fellowship. Authors are thankful to S. Kaur of Panjab University Chandigarh for help in evaluation of binding constant.
All Science Journal Classification (ASJC) codes
- Drug Discovery
- Organic Chemistry