Abstract
Cobalt(II) porphyrazine is synthesized and studied as an active component of a polyvinyl chloride plasticized membrane ion-selective electrodes (ISEs). It is established that regardless of their structure, ISEs are sensitive to iodide. The introduction to the ISE of an ionic additive, ionic liquid 1,3-dihexadecylimidazolium chloride, significantly improves the electrochemical characteristics: the slope of the electrode function reaches −(57 ± 1) mV/dec, c min = 8.3 × 10–6 M. Solid-state screen-printed electrodes the surfaces of which are modified by a 1: 4 mixture of cobalt(II) porphyrazine and ionic liquid 1,3-dihexadecylimidazolium chloride demonstrate satisfactory electrochemical characteristics: the slope of the electrode function is −(56 ± 4) mV/dec and c min = 2.5 × 10–5 M. The potentiometric selectivity of the ISEs for iodide is studied. It is found that the effect of lipophilic interfering ions is significantly lower for solid state ISEs than for plasticized membrane electrodes.
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Original Russian Text © K.N. Otkidach, N.V. Shvedene, P.A. Tarakanov, L.G. Tomilova, I.V. Pletnev, 2016, published in Vestnik Moskovskogo Universiteta, Seriya 2: Khimiya, 2016, No. 4, pp. 284–291.
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Otkidach, K.N., Shvedene, N.V., Tarakanov, P.A. et al. Cobalt(II) porphyrazine as an active component of iodide-selective electrodes. Moscow Univ. Chem. Bull. 71, 270–276 (2016). https://doi.org/10.3103/S0027131416040064
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DOI: https://doi.org/10.3103/S0027131416040064