Organoselenide as a Novel Ionophore for a Silver-Selective Membrane Electrode

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Abstract
Three selenium-containing compounds, diphenyl selenide, benzyl phenyl selenide and dibenzyl selenide were used as neutral carriers to make a Ag+-selective membrane electrode. All three compounds exhibited higher sensitivity to Ag+ than the corresponding sulfides and ethers. The highest sensitivity was obtained by dibenzyl selenide and an electrode constructed using this carrier and bis(l-butylpentyl) adipate as a membrane solvent in a poly(vinyl chloride) membrane matrix exhibited a near-Nernstian response to Ag+ in the concentration range from 1 x 10−5 to 1 x 10−2 M with a slope of 52 mV per concentration decade. The lower limit of detection was around 1 μM. The ion selectivity of this electrode for Ag+ was over 104 times that for other metal cations. Dibenzyl selenide and Ag+ interactions were examined by 1H-NMR spectroscopy.