Cyclic voltammetry of the electron transfer reaction between bis(cyclopentadienyl)iron in 1,2-dichloroethane and hexacyanoferrate in water

The electron transfer (ET) reaction between bis(cyclopentadienyl)iron(II) ([Fe-II(C5H5)(2)]) in 1,2-dichloroethane (1,2-DCE) and hexacyanoferrate redox couple ([Fe-II/III(CN)(6)](4-/3-)) in water (W) at the interface has been studied by using cyclic voltammetry. The voltammetric results can be explained well by a theoretical equation for the so-called IT-mechanism, in which a homogeneous ET reaction between [Fe(C5H5)(2)] (partially distributed from 1,2-DCE) and [Fe(CN)(6)](3-) takes place in the W phase and the resultant [Fe(C5H5)(2)](+) ion is responsible for current passage across the interface. The forward rate constant of the homogeneous ET reaction, [Fe(C5H5)(2)] + [Fe(CN)(6)](3-) = [Fe(C5H5)(2)](+) + [Fe(CN)(6)](4-) in W phase, k(f)(IT), was determined to be (2.9 +/- 2.2)x 10(10) M-1 s(-1), which was in good agreement with k(f)(IT) = (3.2 +/- 2.0)x 10(10) M-1 s(-1), which had been determined by using normal-pulse voltammetry.