title: The electrochemical behaviour of ferrocene in deep eutectic solvents based on quaternary ammonium and phosphonium salts.
abstract: The electrochemical behaviour of ferrocene (Fc) is investigated in six different deep eutectic solvents (DESs) formed by means of hydrogen bonding between selected ammonium and phosphonium salts with glycerol and ethylene glycol. Combinations of cyclic voltammetry and chronoamperometry are employed to characterise the DESs. The reductive and oxidative potential limits are reported versus the Fc/Fc(+) couple. The diffusion coefficient, D, of ferrocene in all studied DESs is found to lie between 8.49 × 10(-10) and 4.22 × 10(-8) cm(2) s(-1) (these do not change significantly with concentration). The standard rate constant for heterogeneous electron transfer across the electrode/DES interface is determined to be between 1.68 × 10(-4) and 5.44 × 10(-4) cm s(-1) using cyclic voltammetry. These results are of the same order of magnitude as those reported for other ionic liquids in the literature.
authors.affiliation: Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur-50603, Malaysia.
authors.forename: Laleh
authors.initials: L
authors.lastname: Bahadori
authors.forename: Ninie Suhana Abdul
authors.initials: NS
authors.lastname: Manan
authors.forename: Mohammed Harun
authors.initials: MH
authors.lastname: Chakrabarti
authors.forename: Mohd Ali
authors.initials: MA
authors.lastname: Hashim
authors.forename: Farouq Sabri
authors.initials: FS
authors.lastname: Mjalli
authors.forename: Inas Muen
authors.initials: IM
authors.lastname: AlNashef
authors.forename: Mohd Azlan
authors.initials: MA
authors.lastname: Hussain
authors.forename: Chee Tong John
authors.initials: CT
authors.lastname: Low