title: Quantification of amplified quenching for conjugated polymer microsphere systems.
abstract: 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 microm. 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 naphthyl-functionalized 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.
authors.affiliation: Department of Materials Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Jessica H
authors.initials: JH
authors.lastname: Liao
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Swager
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D004987:Ethers / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D005453:Fluorescence; D057927:Hydrophobic and Hydrophilic Interactions; D008863:Microspheres; D011137:Polystyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D055672:Static Electricity; D014755:Viologens / Q000737:chemistry*
chemical_list: D000480:Alkynes; D004987:Ethers; D011137:Polystyrenes; D014755:Viologens; C436384:phenyleneethynylene; D005063:Europium