title: Fabrication of spiropyran-containing thin film sensors used for the simultaneous identification of multiple metal ions.
abstract: In this article, a methacrylate-based spiropyran-containing copolymer was used as a colorimetric sensor to identify multiple metal ions simultaneously. Through UV-vis absorption spectroscopy, the relative binding affinity of merocyanine to each metal ion was investigated by displacement studies of a bound metal ion with a second metal ion of a higher binding affinity. We also show that because each metal ion gives rise to a distinct spectral response, partial least-squares discriminant analysis (PLS-DA) can be used to analyze the UV-vis absorbance spectra to identify the two metal ions that are present in solution at varying concentrations simply by dipping a coated polymer substrate into solution after irradiation. Partial least-squares regression analysis (PLS) was used to determine the metal ions in solution for several binary mixtures quantitatively. We also demonstrate that the quantitative determination depends on the relative binding preference of merocyanine to each metal ion.
authors.affiliation: Department of Chemistry, Faculty of Engineering, and the Center for Nanoscale Science and Engineering, University of Georgia, Athens, Georgia 30602, USA.
authors.forename: Kristen H
authors.initials: KH
authors.lastname: Fries
authors.forename: Jeremy D
authors.initials: JD
authors.lastname: Driskell
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Sheppard
authors.forename: Jason
authors.initials: J
authors.lastname: Locklin
mesh_terms: D001578:Benzopyrans / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D016018:Least-Squares Analysis; D008567:Membranes, Artificial; D019216:Metals, Heavy / Q000032:analysis*; D015394:Molecular Structure; D009574:Nitro Compounds / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry; D013499:Surface Properties
chemical_list: D001578:Benzopyrans; D007211:Indoles; D007477:Ions; D008567:Membranes, Artificial; D019216:Metals, Heavy; D009574:Nitro Compounds; D009942:Organometallic Compounds; C088184:spiropyran