A Simple Method for Examining the Electrochemistry of Metalloporphyrins and Other Hydrophobic Reactants in Thin Layers of Organic Solvents Interposed between Graphite Electrodes and Aqueous Solutions
- 3 July 1998
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 70 (15) , 3114-3118
- https://doi.org/10.1021/ac980426k
Abstract
A method is described for the preparation of stable, adherent, thin layers of organic solvents interposed between the surfaces of graphite electrodes and aqueous supporting electrolytes in which they are immersed. The electrochemistry of reactants dissolved in the thin layers is examined and utilized to evaluate surface coverages and formal potentials for molecules, such as cobalt tetraphenylporphyrins, that do not exhibit useful electrochemical responses when adsorbed on graphite. The thin layers of organic solvent can be used to concentrate analytes by extracting them from dilute aqueous solutions to produce enhanced sensitivity in electroanalytical applications. Electron transfer across the liquid/liquid interface created by the presence of the thin layer of immiscible organic solvent is also demonstrated.Keywords
This publication has 13 references indexed in Scilit:
- (5,10,15,20-Tetramethylporphyrinato)cobalt(II): A Remarkably Active Catalyst for the Electroreduction of O2 to H2OInorganic Chemistry, 1998
- Long-Range Electron Transfer through a Lipid Monolayer at the Liquid/Liquid InterfaceJournal of the American Chemical Society, 1997
- Scanning Electrochemical Microscopy. 34. Potential Dependence of the Electron-Transfer Rate and Film Formation at the Liquid/Liquid InterfaceThe Journal of Physical Chemistry, 1996
- Scanning Electrochemical Microscopy. 31. Application of SECM to the Study of Charge Transfer Processes at the Liquid/Liquid InterfaceThe Journal of Physical Chemistry, 1995
- Chemical catalysis of electrochemical reactions. Homogeneous catalysis of the electrochemical reduction of carbon dioxide by iron("0") porphyrins. Role of the addition of magnesium cationsJournal of the American Chemical Society, 1991
- Efficient reduction of dioxygen with ferrocene derivatives, catalyzed by metalloporphyrins in the presence of perchloric acidInorganic Chemistry, 1989
- Charge transfer between two immiscible electrolyte solutionsJournal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1986
- Relation between the potentials where adsorbed and unadsorbed cobalt(III) tetrakis(N-methylpyridinium-4-yl)porphyrin is reduced and those where it catalyzes the electroreduction of dioxygenInorganic Chemistry, 1985
- Spectroscopic studies for tetraphenylporphyrincobalt(II) complexes of carbon monoxide, nitrogen oxide, molecular oxygen, methylisonitrile, and trimethyl phosphite, and a bonding model for complexes of carbon monoxide, nitrogen oxide, and molecular oxygen with cobalt(II) and iron(II) porphrinsJournal of the American Chemical Society, 1974
- Mass-spectrometric study of polydentate Schiff-base coordination compounds. I. Cobalt(II), nickel(II), and copper(II) complexes of Salen [bis(salicylidene)ethylenediamine] and Oaben [bis(o-aminobenzylidene)ethylenediamine]Journal of the American Chemical Society, 1973