'Robust Self-Assembled Monolayers of Ru(II) and Os(II) Polypyridines on Gold Surfaces: Exploring New Potentials'
Citation:
F. A. Murphy, S. Suárez, E. Figgemeier, E. R. Schofield, S. M. Draper., 'Robust Self-Assembled Monolayers of Ru(II) and Os(II) Polypyridines on Gold Surfaces: Exploring New Potentials', Chemistry a European Journal, 15, 23, 2009, 5740 - 5748Download Item:
Robust Self Assembled Monolayers.pdf (Published (author's copy) - Peer Reviewed) 477.3Kb
Abstract:
Metal complexes [M(phtpy)(pztpy)](PF6)2 (phtpy = 4'-phenyl-2,2':6',2"-terpyridine, pztpy = 4'-(Npiperazinyl)-
2,2':6',2"-terpyridine, M = Ru, Os) were prepared and examined spectroscopically and
electrochemically. The piperazine attachment was found to significantly modify the photophysical and
electrochemical properties compared to the parent bis-terpyridine complexes, causing a red-shift of the
1MLCT (23 nm) and a substantial cathodic shift of the redox potential (0.30 V for Ru, 0.23 V for Os).
Self-assembled monolayers (SAMs) of the complexes on polished gold electrodes were generated
simply via the in situ formation of a dithiocarbamate (DTC) anchoring group at the terminal piperazinyl
nitrogen on the pztpy ligand. Cyclic voltammetry revealed that the monolayers show excellent
reversible behaviour and exceptional stability. The high stability of the SAMs is attributed to the strong
bidentate attachment to the gold surface of the DTC tether and the favourable low oxidation potentials
of the complexes which result from the electron-rich piperazine nitrogen on the pztpy ligand. Such
DTC-based SAMs demonstrate a substantial improvement over commonly-employed thiol-based
systems, and offer new scope for future development.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/smdraperDescription:
PUBLISHED
Author: MURPHY, FRANCES; DRAPER, SYLVIA
Type of material:
Journal ArticleCollections:
Series/Report no:
Chemistry a European Journal15
23
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Full text availableKeywords:
ChemistrySubject (TCD):
Nanoscience & Materials , Smart & Sustainable PlanetDOI:
http://dx.doi.org/10.1002/chem.200801930Licences: