Polarographic Behavior of Iron(III)-1-Pyrrolidinecarbodithioate Chelate in Methyl Isobutyl Ketone

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Other Title
  • メチルイソブチルケトンを用いる鉄(III)-1-ピロリジンカルボジチオ酸キレートの溶媒抽出ポーラログラフィー
  • メチルイソブチルケトンを用いる鉄（ＩＩＩ）‐１‐ピロリジンカルボジチオ酸キレートの溶媒抽出ポーラログラフィー

Description

Extraction-polarography in an organic phase is very useful for the investigation of the extraction mechanisms. Polarographic behaviors of tetraethylammonium 1-pyrrolidinecarbodithioate (Et4Npcd) and iron (III)-1-pyrrolidinecarbodithioate (iron (III)-pcd) chelate were investigated in methyl isobutyl ketone (MIBK) containing 0.1 mol/l tetrabutylammonium perchlorate as a supporting electrolyte. Et4Npcd shows an oxidation wave at a dropping mercury electrode (DME) with the half-wave potential of 0.63 V vs. SCE. The oxidation process is diffusion- controlled with one electron transfer. A d. c. polarogram for iron (III) -pcd chelate in anhydrous MIBK shows one oxidation wave and one reduction wave at the DME. The half-wave potentials are- 0.07 and -0.62 V, respectively. The oxidation wave is due to the mercury dissolution by the iron (III) -pcd chelate and the reduction wave is due to the one electron reduction of iron (III) to iron (II) -pcd chelate. The cyclic voltammogram for the iron (III)-pcd chelate at the platinum disk electrode shows an oxidation wave to iron (IV) chelate and a reduction wave to iron(II) chelate. The peak potentials are about +O.5 V and -0.5 V, respectively. Iron (III) is quantitatively extracted from a citrate buffer with Et4Npcd into MIBK in the pH range above 4.0. From the polarography in the extract, it was found that pcd and citric acid are co-extracted with the iron (III)-pcd chelate and that the iron (III) chelate and pcd are slowly decomposed.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1976 (5), 773-776, 1976-05-10

    The Chemical Society of Japan

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