Selective transfer of Ag+ at the water|1,2-dichloroethane interface facilitated by complex formation with a calixarene derivative

Pat O'Dwyer, Vincent J. Cunnane

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    The facilitated transfer of silver, Ag+, has been studied at the Interface between Two Immiscible Electrolyte Solutions (ITIES). The transfer was achieved with the assistance of a calixarene-based silver ionophore. An investigation of the mechanistic details of the transfer was conducted using cyclic voltammetry at both micro and macro liquid|liquid interfaces. The mechanism was found to follow a Transfer by Interfacial Complexation (TIC)/Transfer by Organic phase Complexation (TOC) mechanism. The complex stoichiometry was found to shift from 1:1 to 1:2, metal:ligand, with increasing ionophore concentration. The logarithms of the complex association constants, logβ1oandlogβ2o, were estimated at 12.4 and 14.5, respectively. The charge transfer current was also found to be limited by diffusion of the transferring species and was unchanged by the presence of a range of interferents. The system thus shows promise for selective analytical applications.

    Original languageEnglish
    Pages (from-to)16-21
    Number of pages6
    JournalJournal of Electroanalytical Chemistry
    Volume581
    Issue number1
    DOIs
    Publication statusPublished - 15 Jul 2005

    Keywords

    • Association constants
    • Calixarene
    • Ion transfer
    • Ion-selective electrode
    • Liquid|liquid interfaces
    • Micropipette

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