1,3-Alternate Calix[4]arene Functionalized With Pyrazole and Triazole Ligands as a Highly Selective Fluorescent Sensor for Hg²⁺ and Ag⁺ Ions.

ABSTRACT: We report here the synthesis of a 1,3-alternate calix[4]arene 8, with bis-pyrazolylmethylpyrenes on the one end and bis-triazolylmethylphenyls on the other end, as a homoditropic fluorescent sensor for both Hg²⁺ and Ag⁺ ions. Calix[4]arene 3, with lower-rim bis-pyrazolylmethylpyrenes in cone conformation, was also synthesized as a control compound. UV-Vis and fluorescence spectra were used for metal ions screening, and we found that both ligands 8 and 3 showed strong excimer emission of pyrenes when they are as a free ligand in CHCl₃/MeOH (v/v, 3:1) solution; however, they both showed a high selectivity toward Hg²⁺ and Ag⁺ ions with strong fluorescence quenching and yet with different binding ratios. The flu

SUBMITTER: Chen YJ 

PROVIDER: S-EPMC7688584 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature