title: pH-Controlled "off-on-off" switch based on Cu(2+)-mediated pyrene fluorescence in a PAA-SDS micelle aggregated supramolecular system.
abstract: We report herein the fluorescence response of pyrene in the presence of sodium dodecyl sulfate (SDS) micelle and poly(acrylic acid) (PAA) with Cu(2+) as an ionic quencher. Pyrene present in the PAA-SDS complex is quenched by Cu(2+) at pH approximately 2 ("off" state). Quenched pyrene emission is recovered at pH approximately 8 ("on" state). Due to easy protonation and deprotonation of the PAA chain in aqueous solution, this pH-controlled micellar ternary system exhibits a highly reversible "off-on-off" switch of the pyrene emission.
authors.forename: Prasun
authors.initials: P
authors.lastname: Bandyopadhyay
authors.forename: Amit K
authors.initials: AK
authors.lastname: Ghosh
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D011721:Pyrenes / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D000180:Acrylic Resins; D005456:Fluorescent Dyes; D008823:Micelles; D011721:Pyrenes; D012967:Sodium Dodecyl Sulfate; C006903:carbopol 940; D003300:Copper