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K. N. Otkidach, N. V. Shvedene, P. A. Tarakanov, L. G. Tomilova, I. V. Pletnev
Cobalt (II) porphyrazine as an active
component of iodide-selective electrodes
Abstract
Cobalt (II) porphyrazine is synthesized and
investigated as an active electrode component of polyvinyl chloride plasticized
membrane ion-selective electrodes (ISEs) as well as solid-state ISEs for
iodide. The introduction of an ionic additive, ionic
liquid1,3-dihexadecylimidazolium chloride, significantly improves
electrochemical characteristics of the membranes ISE: the slope of the
electrode function reaches −(57±1) mV/dec, cmin =
8.3·10-6 M. Solid-state screen printed electrodes which surface has
been modified by 1:4 mixture of cobalt (II) porphyrazine and ionic
liquid1,3-dihexadecylimidazolium chloride demonstrate satisfactory
electrochemical characteristics: the slope of the electrode function is −(56±4)
mV/dec and cmin = 2.5·10-5 M. A good selectivity towards iodide over
a number of anions was observed. It was found that the effect of lipophilic
interfering ions is significantly lower for solid state ISEs than for
plasticized membrane electrodes.
Key words: cobalt
(II) porphyrazine, ion-selective electrodes, iodide, ionic liquid, solid-state
electrodes.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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