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    Quantification of Amplified Quenching for Conjugated Polymer

    Year: 2007

    Journal: Langmuir 2007, 23, 112-115, 20111221

    Authors: Jessica H. Liao and Timothy M. Swager

    Organizations: Department of Materials Science and Department of Chemistry and Institute for Soldier Nanotechnologies,

    A series of nonaggregating carboxylate-functionalized poly(phenylene ethynylene)s (PPEs) have been synthesized for immobilization via electrostatic adsorption onto Eu3+ -polystyrene microspheres with a mean diameter of 0.2 μm. This system is shown to constitute a ratiometric system that measures fluorescence quenching with high fidelity. The fluorescence quenching properties of the polymer-coated particles in response to methyl viologen and a naphthylfunctionalized viologen have been investigated in aqueous solutions to study the influence of electrostatic and hydrophobic interactions with pentiptycene-incorporated as well as macrocycle-containing polymers.