title: Dicarboxylated ethynylarenes as buffer-dependent chemosensors for Cd(II), Pb(II) and Zn(II).
abstract: Two dicarboxylated ethynylarenes were prepared efficiently from condensation of 1,3-bis(3-aminoph enylethynyl)benzene with two equivalents of either succinic anhydride or glutaric anhydride. These compounds behave as fluorescent chemosensors selective for Cd(II), Pb(II) and Zn(II) cations under buffered aqueous conditions, with analyte binding observed as bathochromically shifted, intensified fluorescence. It was noteworthy that the fluorescence responses varied significantly with buffer identity. A conformational restriction mechanism involving reversible interactions between the fluorophore, metal cation and buffer itself is proposed.
authors.affiliation: Department of Chemistry, Creighton University, 2500 California Plaza, Omaha, NE, 68178, U.S.A.
authors.forename: James T
authors.initials: JT
authors.lastname: Fletcher
authors.forename: Brent S
authors.initials: BS
authors.lastname: Bruck
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Deever
keywords: Cation detection; Ethynylarene; Fluorescent; Ratiometric; Sensor