Visible Light Activated Ion Sensing Using a Photoacid Polymer for Calcium Detection

    Authors

    V. K. Johns; P. K. Patel; S. Hassett; P. Calvo-Marzal; Y. Qin;K. Y. Chumbimuni-Torres

    Comments

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    Abbreviated Journal Title

    Anal. Chem.

    Keywords

    STATE PROTON-TRANSFER; PHOTOCHROMIC SPIROPYRAN; POLY(VINYL CHLORIDE); SELECTIVE ELECTRODES; GENERATING SYSTEMS; OPTODES; SENSOR; MEMBRANES; DESIGN; PLASTICIZER; Chemistry, Analytical

    Abstract

    Presented here is a sensing membrane consisting of a modified merocyanine photoacid polymer and a calcium ionophore in plasticized poly(vinyl chloride). This membrane is shown to actively exchange protons with calcium ions when switched ON after illumination at 470 nm, and the exchange can be followed by UV-vis spectroscopy. The sensing membrane shows no response in the ON state when calcium ions are absent. The limit of detection of the sensor is 5.0 x 10(-4) M with an upper detection limit of 1.0 M. Thus, we demonstrate for the first time the use of a visible light activated, lipophilic photoacid polymer in an ion-sensing membrane for calcium ions, which highly discriminates potassium, sodium, and magnesium ions.

    Journal Title

    Analytical Chemistry

    Volume

    86

    Issue/Number

    13

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    6184

    Last Page

    6187

    WOS Identifier

    WOS:000338488800004

    ISSN

    0003-2700

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