Pyrene-Linked Triazole-Modified Homooxacalix[3]arene: A Unique C3 Symmetry Ratiometric Fluorescent Chemosensor for Pb2+

A new type of fluorescent chemosensor based on homooxacalix[3]arene was synthesized. The fluorescent sensor was highly selective for Pb2+ in comparison with other metal ions tested by enhancement of the monomer emission of pyrene. The C-3 symmetric structure of homooxacalix[3]arene has potential application in the development of a new ratiometric fluorescent chemosensor for heavy metal ions.