Investigation of proton transfer across the water/1,2-dichloroethane interface by o-phenanthroline using glass micro/nano-pipets and cyclic voltammetry

Facilitated proton transfer across the water/1,2-dichloroethane (DCE) inter face supported on the tips of micro- and nano-pipets by o-phenanthroline (P hen) was studied by using cyclic voltammetry. The formed micro- and nano-li quid/liquid interfaces functioned as micro- and nano-electrodes under certa in experimental conditions. The dependence of the half-wave potentials on t he aqueous solutions acidities was studied and the ratio of association con stants between Phen and proton in the aqueous and DCE phases was calculated by the method proposed by Matsuda et al.. The standard rate constant (k(0) ) and the transfer coefficient (alpha) evaluated by using nano-pipets were equal to 0.183 +/- 0.054 cm/s and 0.70 +/- 0.09, respectively.