A New Polymer-Based Fluorescent Chemosensor Incorporating Propane-1,3-Dione and 2,5-Diethynylbenzene Moieties for Detection of Copper(II) and Iron(III)

摘要

A novel conjugated polymer (PDBDBM) was developed by the polymerization of 1,4-dioctyloxy-2,5-diethynylbenzene with 1,3-bis(4-bromophenyl)propane-1,3-dione based on Pd-catalyzed Sonogashira-coupling reaction. The obtained polymer PDBDBM exhibited bright green photoluminescence under UV irradiation. According to the metal ion titration experiments, PDBDBM showed high sensitivity and selectivity for detection of Cu 2+ and Fe 3+ over other metal ions. The fluorescent detection limits of PDBDBM were calculated to be 5 nM for Cu 2+ and 0.4 μM for Fe 3+ and the Stern–Volmer quenching constant for Cu 2+ and Fe 3+ were found to be 1.28 × 10 8 M ?1 and 2.40 × 10 4 M ?1 , respectively. These results indicated that the polymer can be used as a potential probe for Cu 2+ and Fe 3+ detection.