Opto-electroactive amino- and pyridyl-terminated monolayers of ruII-terpyridyl complexes and their usage as Hg2+ sensors
Robust opto-electroactive monolayers of three different RuII-terpyridyl complexes with amino and pyridyl termination are fabricated on SiOx-based substrates using siloxane-based attachment chemistry and either pyridyl or amine linkage to the preliminary prepared template. The UV-vis spectra of these...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
21 February 2019
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| In: |
The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2019, Volume: 123, Issue: 10, Pages: 6121-6129 |
| ISSN: | 1932-7455 |
| DOI: | 10.1021/acs.jpcc.9b00894 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1021/acs.jpcc.9b00894
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| Author Notes: | Prakash Chandra Mondal, Vikram Singh, Yekkoni L. Jeyachandran, and Michael Zharnikov |
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| 520 | |a Robust opto-electroactive monolayers of three different RuII-terpyridyl complexes with amino and pyridyl termination are fabricated on SiOx-based substrates using siloxane-based attachment chemistry and either pyridyl or amine linkage to the preliminary prepared template. The UV-vis spectra of these monolayers display the characteristic metal-to-ligand charge-transfer bands, with a bathochromic shift compared to the spectra of the respective metalloligands dissolved in acetonitrile solution. This shift is notably larger for the pyridyl-linked monolayers compared to the amino-linked film, correlating qualitatively with the molecular grafting density. Cyclic voltammograms of the monolayers covalently attached onto indium tin oxide electrodes show reversible switching between the two redox states (Ru2+ to Ru3+ and vice versa), with a typical one-electron redox behavior. The sensing response of the monolayers to a series of different metal ions was tested, with the amino-decorated films showing a particularly high sensitivity to Hg2+ and a close-to-linear response to this analyte in the ppm concentration range. | ||
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