Electron Transfer Reactions of Tetrakis (2, 2- Bipyridine)-µ Oxodiiron(III) Complex and Dithionate Ion in Aqueous Acidic Media: Kinetic and Mechanistic Approach
Keywords:
Electron transfer, kinetics, mechanism, dithionateAbstract
Communication in Physical Sciences, 2023, 10(1): 57-66
Authors: Atim Sunday Johnson, Idongesit Bassey Anweting* and Idongesit Edem Okon
Received: 18 July 2023/Accepted 20 September 2023
Electron transfer reaction of tetrakis(2,2’- bipyridine)-µ-oxodiiron(III) complex (Fe2O4+) and dithionate (S2O62- ) has been carried out in aqueous hydrochloric acid. The reaction was carried out at [H+] = 1.0 × 10-3 mol dm-3, I = .3.0 × 10-1 mol dm-3(NaCl), T= 26 ± 1°C, and λmax = 520nm. The stoichiometric ratio of the reaction is 1:1.The reaction is first order with respect to [Fe2O4+] and zero-order on [S2O62-] and is not hydrogen ion and ionic strength dependent. Added anions and cations do not affect the reaction, there was no gel formation upon the addition of acrylamide and excess methanol to the reaction mixture, which shows the absence of polymerisation, The products of the reaction were identified as Fe2+ and SO42-. With recourse to empirical data, the reaction is rationalised to occur via an outer sphere pathway with ion pair character. A Plausible mechanism has been proposed for the reaction.
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