Doshisha Univ. Dept. of Applied Chemistry Kamikyo-ku, Kyoto-shi 602 Japan
Abstract:
The electrofluorination of acetamide (CH3CONH2) and formamide (HCONH2) on the anode was studied in a molten KH2F3 at 120°C. Amorphous carbon was used as the anode and Pt rod as the reference electrode. Anodic products were analyzed by both gas chromatography and infrared spectroscopy.In the both CH3CONH2 and HCONH2, the anode effect did not occur in the current density range of 3-11mA2cm2 and anode gas was then composed of N2(+O2), NF3, CF4, C2F6, N2O, CO2(+COF2) and so on. The addition of 1.0w% LIF to the electrolyte was available for prevention from the anode effect.From these results, it is suggested that CH3CONH2 and HCONH2 would react chemically with fluorine radical produced by the discharge of fluoride ion and that the change of the CmFn (CF)n?I] film on the anode to (CF)n (CF)n?II] film was prevented specially in the case of HCONH2. The mechanism of electrofluorination of CH3CONH2 in the melt is as folIows; CH3CONH2 CH3COF,·NH2 N2,NF3,CF4,C2F6,CHF3,COF2(CO2),N2O.
