Photolysis of Methyltrioctylammonium Tetrachloroferrate (III)

Akimitsu KAKUI, Daisuke TAKADA and Hiroshi WATANABE*

Department of Materials and Chemical Engineering, Faculty of Engineering, Shizuoka University;
3-5-1 Johoku, Hamamatsu-shi 432-8561 Japan

It has been revealed that iron(III) complex containing methyltrioctylammonium chloride (MTOAC; RR'3NCl, R=CH3-, R'=C8H17-), RR'3N[FeCl4], was decomposed by light. On this study, the authors explore the photolysis of MTOAC-Fe(III) complex, MTOA[FeCl4] during the extraction procedure from iron(III) hydrochloric acid solution with extractants in benzene. It was deduced that dihexyl sulfide (DHS; R″2S, R″=C6H3-) accelerated the photolysis, and that the photolysis was suppressed with the increase of MTOAC concentration. The effect of oxygen during the above procedure and the electronic spectra in aqueous phase suggest that complex MTOA[FeCl4] was reduced to iron(II) species through decomposition and was then gradually re-oxidized to iron(III) by air upon standing. Triisobutylphosphine sulfide (Cyanex 471X; R'''3PS, R'''=i-C4H9-), which is the neutral sulfur-containing extractant, also showed the same behavior with DHS for the photolysis of the complex. The photolysis mechanism was discussed based on these results.

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