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Structure of Momolayers of Silicotungstate Anions on Ag(111) and Au(111) Electrode Surfaces

Published online by Cambridge University Press:  10 February 2011

Maohui Ge
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Brian K. Niece
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Craig G. Wall
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Walter G. Klemperer*
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Andrew A. Gewirth*
Affiliation:
Department of Chemistry, Frederick Seitz Materials Research Laboratory, and Beekman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
*
* Authors to whom correspondence should be addressed.
* Authors to whom correspondence should be addressed.
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Abstract

α-Dodecatungstosilicate (α-SiW12O404−) anions form ordered monolayers on Ag(111) and Au(111) surfaces. In-situ STM images reveal that the silicotungstate ion forms a square adlattice with an intermolecule spacing of 10.2 ± 0.5 Å on both Ag and Au surfaces. Additional structures exhibiting either row or rhombic motifs are observed on Au electrodes. The structure of the adlattices can be modeled using a simple model which maximizes the coordination of the silicotungstate ion to the electrode while maintaining van der Waals contacts between terminal oxygens of adjacent silicotungstates.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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Structure of Momolayers of Silicotungstate Anions on Ag(111) and Au(111) Electrode Surfaces
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