The electron transfer across the liquid vertical bar liquid interface between aqueous solutions (W) of Fe-III/II compounds (hexacyanoferrates, chlorides) and a (t-butyl) substituted Lu(III)bisphthalocyanine in dichlorohexane (DCH) or nitrobenzene (NB), has been studied by voltammetry at a microinterface and by spectrophotometry. The electron transfer wave has been observed only at the W vertical bar DCH. Coupling with an ion transfer facilitates this electron transfer: the Lu(III)bisphthalocyanine has been oxidized or reduced across the W vertical bar NB interface, depending on the ion establishing the interfacial potential. (C) 2011 Elsevier B.V. All rights reserved.