Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5008717 | Sensors and Actuators B: Chemical | 2018 | 11 Pages |
â¢Well-defined terpyridyl appended poly(metaphenylene-alt-fluorene) Ï-conjugated blue emissive polymers.â¢Turn off fluorescent probe for selective and on-site detection of Cu2+.â¢High sensitivity towards Cu2+ in ppb level as a result of molecular wire effect.
Highly soluble and emissive poly(metaphenylene-alt-fluorene) Ï-conjugated alternative copolymers, with pendant terpyridyl binding sites conjugated to metaphenylene unit, have been synthesized through Pd(0)-catalyzed Suzuki coupling polymerization. For solubilizing in common organic solvents, octyl (P1) or 2-(2-(2-methoxyethoxy)ethoxy)ethyl (P2) side groups have been introduced at 9-position of fluorene. The well-defined copolymers have been characterized by multinuclear NMR and tetradetector GPC with excellent PDI values of 1.28 and 1.14 respectively. The blue emissive Ï-conjugated polymers show remarkable selectivity and sensitivity towards Cu2+ as turn off fluorescent probes without interference by other competing metal ions, as a result of molecular wire effect. The detailed photophysical and sensing studies have been demonstrated to understand the insight of polymer-metal ion interaction which is responsible for selective fluorescence quenching. Moreover, the polymeric sensors (P1 and P2) are reversible, and can also act as secondary sensors for S2â. The limit of detection (LOD) towards Cu2+ in ppb level with relatively high association constants of 4.1-3.2Â ÃÂ 105Â Mâ1 has prompted us to explore as thin-film polymeric sensor for Cu2+ to develop solid state test kits for practical utility.
Graphical abstractAs a result of molecular wire effect, poly(metaphenylene-alt-fluorene) based Ï-conjugated polymer probes exhibit remarkable high selectivity and sensitivity towards Cu2+ as turn off fluorescent chemosensor.Download high-res image (144KB)Download full-size image