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Self-assembled monolayers of ruthenium and osmium bis-terpyridine complexes - Insights of the structure and interaction energies by combining scanning tunneling microscopy and electrochemistry

Figgemeier, E. and Merz, L. and Hermann, B. A. and Zimmermann, Y. C. and Housecroft, C. E. and Guntherodt, H. J. and Constable, E. C.. (2003) Self-assembled monolayers of ruthenium and osmium bis-terpyridine complexes - Insights of the structure and interaction energies by combining scanning tunneling microscopy and electrochemistry. Journal of Physical Chemistry B, 107 (5). pp. 1157-1162.

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Official URL: https://edoc.unibas.ch/76362/

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Abstract

Self-assembled monolayers of [Ru(terpy)(terpy-py)](2+) and [Os(terpy)(terpy-py)](2+) salts (terpy is 2,2`:6`,2``-terpyridine and terpy-py is 4`-(4-pyridyl)-2,2`:6`,2``-terpyridine) on platinum were investigated by means of STM and electrochemistry. The STM experiments reveal that the species within the monolayer are ordered in a hexagonal array. This information was utilized together with the scan rate dependency of the peak current density (j(p)) of potential sweep experiments to calculate interaction energies within the monolayer. Significantly, the repulsive interactions within the monolayers of 2,2`:6`,2``-terpyridine complex are greater than those observed with analogous 2,2`-bipyridine species. This results in a lower overall surface coverage, an ordered structure where each particle has 6 closest neighbors, and a shift of the redox potentials toward more positive values with the terpy complexes. Also, a correlation between the solvent dielectric constant and the interaction energies could be established, reflecting the different ability of the solvent to screen charges depending upon its polarity.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Former Organization Units Chemistry > Anorganische Chemie (Constable)
UniBasel Contributors:Constable, Edwin Charles
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:1520-6106
e-ISSN:1520-5207
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Apr 2020 13:57
Deposited On:22 Apr 2020 13:57

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