AI Article Synopsis
- Electron transfer kinetic rate constants were measured in Ethaline (a deep eutectic solvent) for ferrocene/ferrocenium and ferrocyanide/ferricyanide redox couples, showing that they are only slightly lower than those in traditional solvents like acetonitrile and water, approximately 50% or less.
- In comparison, electron transfer rates in ionic liquids are significantly slower, about 100 times lower than in classical solvents.
- The findings are analyzed using Marcus Theory, specifically focusing on the solvent relaxation time and its impact on adiabatic electron transfer processes.
Article Abstract
Electron transfer (ET) kinetic rate constants in Ethaline (1:2 choline chloride + ethylene glycol) have been measured for two common redox couples (ferrocene/ferrocenium and ferrocyanide/ferricyanide) on a glassy carbon electrode and compared with ET kinetics in ionic liquids and classical organic solvents in the same conditions (acetonitrile and water). Particular care has been taken to treat ohmic drop in DES. For both couples, we found that ET rate constants are just a little lower than those measured in classical solvents (around 50% or less). These results contrast with ET rates in ionic liquids where electron transfers are considerably slower (100 times lower). Data are discussed as a function of the solvent relaxation time using Marcus Theory for an adiabatic electron transfer.
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| http://dx.doi.org/10.1021/acs.jpcb.9b09022 | DOI Listing |
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