Electrochemistry of Ferrocene in 1-Methyl-3-Ethylimidazolium Chloride/Aluminum Chloride Room Temperature Melts.
Technical rept. 1 Jun-25 Jul 86,
FRANK J SEILER RESEARCH LAB UNITED STATES AIR FORCE ACADEMY CO
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Ferrocene has been studied in 1-Me-3-EtImCl-A1C13 melts over a range of Lewis acidities by varying the melt composition from 0, 4 to 0,6 mole fraction of A1C13. The redox potential for ferrocene is not influenced by chloride concentration in the melts and is 0.40 or - 0.005 V vs A1 in 0.6 melt. Ferrocene is stable in basic and neutral melts but reacts chemically in acidic melts. Kinetic studies show the chemical reaction to be second order with a rate constant of about .00009 1M sec, at 27C. The reversible redox processes were studied using cyclic voltammetric, steady-state potentiostatic and rotating disk electrode voltammetry at glassy carbon electrodes. Kinetic parameters indicate the electrode processes to be kinetically controlled and the rate limiting step is a chemical process following the electron transfer for both oxidation and reduction.
- Physical Chemistry