A Pyrenyl-Appended Triazole-Based Calix[4]arene as a Fluorescent Sensor for Cd²⁺ and Zn²⁺

The synthesis and evaluation of a novel calix[4]arene-based fluorescent chemosensor 8 for the detection of Cd2+ and Zn2+ is described. The fluorescent spectra changes observed upon addition of various metal ions show that 8 is highly selective for Cd2+ and Zn2+ over other metal ions. Addition of Cd2+ and Zn2+ to the solution of 8 results in ratiometric measurement.