Synthesis and fluorescence sensing properties of novel pyrene-armed calix[4] arene derivatives

Fluorogenic tert-butylcalix[4]arenes bearing two pyrene pendant groups at the lower rim were synthesized. Based on ratiometric changes of monomer and excimer emissions, the pyrene amine derivative of calix[4]arene has been found to act as a selective sensor for Pb2+ and Cu2+ ions, respectively, due to a conformational change upon chelation of these ions. (c) 2011 Elsevier Ltd. All rights reserved.