The electron transfer reaction between bis(phthalocyaninato)lutetium(III) ([Lu(pc)(2)](0)) in 1,2-dichloroethane (1,2-DCE) and hexacyanoferrate(II/III) redox couple ([Fe(CN)(6)](4-/3-)) in water (W) at the interface was studied by the use of normal pulse voltammetry and acvoltammetry. The ac-voltammetric results have reconfirmed that the electron transfer reaction between [Lu(pc)(2)] in 1,2-DCE and [Fe(CN)6](4-/3-) in W takes place by way of the heterogeneous electron transfer at the interface, but not by the homogeneous electron transfer reaction associated with the ion transfer of redox species across the interface. The kinetic parameters of the heterogeneous electron transfer reaction at the interface were determined. (c) 2007 Elsevier B.V. All rights reserved.