非水溶液中の金属イオンのポーラログラフ極大波の抑制剤

概要

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In aprotic solutions of inorganic ions there are many polarographic data on the reduction wave often accompanied by the maximum wave, and this makes accurate measurements of half wave potentials impossible. For instance in tetrabutylammonium perchlorate (Bu_4NClO_4)-hexamethylphosphoric triamide (HMPA) solution, the zinc ion showed a large, diffusion controlled reduction wave, but accompanied by a large maximum (E_<1/2>=-1.7 V). In the case of cobalt ion, the polarographic reduction was similar to the zinc ion. Tetraethylammonium ion (Et_4N^+), N, N-hexamethylenepiperidinium ion (5N6^+), hexamethonium ion were found to be very good maximum suppressors for these cases, and the effect was more enhanced in the order of Et_4N^+<5N6+<hexamethonium ion. In the case of barium ion (E_<1/2>= -2.4 V) in Li^+-HMPA, effects of the three maximum suppressors were too strong and Ba^<2+> could not be reduced at a certain concentration of the suppressor. The drop time of mercury at -1.7 V and -2.4 V became shorter in the order of hexamethonium ion <5N6+<Et_4N^+<Bu_4N^+ <Li^+, which suggests the order of adsorption of these ions on the mercury electrode.
社団法人日本分析化学会の論文
1980-09-05