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https://hdl.handle.net/2440/49817
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Type: | Journal article |
Title: | Electrochemistry of catechol terminated monolayers with Cu(II), Ni(II) and, Fe(III) cations: A model for the marine adhesive interface |
Author: | Brooksby, P. Schiel, D. Abell, A. |
Citation: | Langmuir: the ACS journal of surfaces and colloids, 2008; 24(16):9074-9081 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2008 |
ISSN: | 0743-7463 1520-5827 |
Statement of Responsibility: | Paula A. Brooksby, David R. Schiel and Andrew D. Abell |
Abstract: | The redox electrochemistry of hydroquinone and Cu2+-, Ni2+-, and Fe3+-hydroquinone complexes immobilized at the SAM interface has been studied in aqueous solutions with pH 5 to 12 using cyclic voltammetry. Self-assembled monolayers were constructed with terminal hydroquinone residues designed to model marine adhesive proteins that use the DOPA (3,4-dihydroxyphenylalanine) moiety. Coordination of metal to the hydroquinone group results in a shift to the ligand oxidation potential, with the value for Delta E p,a dependent on the solution pH and identity of the metal. Cu2+ shifts the hydroquinone oxidation by -285 mV (pH 8.8), and Ni2+ by -194 mV (pH 9.16). The hydroquinone oxidation was shifted by -440 mV at pH 5 for Fe3+ solutions examined up to pH 7. By contrast, reduction of the quinone is unperturbed by the presence of Cu2+, Ni2+, and Fe3+ ions. Implications of these results to the mechanism of marine adhesion are discussed. |
Keywords: | Cations Copper Iron Nickel Alkanes Catechols Sulfhydryl Compounds Adhesives Molecular Structure Oxidation-Reduction Electrochemistry Hydrogen-Ion Concentration Surface Properties Models, Chemical Oceans and Seas |
Description: | Copyright © 2008 American Chemical Society |
DOI: | 10.1021/la8007816 |
Published version: | http://dx.doi.org/10.1021/la8007816 |
Appears in Collections: | Aurora harvest 5 Chemistry and Physics publications |
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