Anchoring of porphyrins on atomically defined cobalt oxide: In-situ infrared spectroscopy at the electrified solid/liquid interface

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10448470" target="_blank" >RIV/00216208:11320/22:10448470 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xGoI7W9-QM" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xGoI7W9-QM</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.susc.2021.122013" target="_blank" >10.1016/j.susc.2021.122013</a>

Result language
angličtina
Original language name
Anchoring of porphyrins on atomically defined cobalt oxide: In-situ infrared spectroscopy at the electrified solid/liquid interface
Original language description
In this work, we studied the interaction of 5-mono(4-phosphonatophenyl)-10-15-20-(triphenyl) porphyrin (MPTPP) with an atomically-defined Co3O4(111) surface in electrochemical environments. We prepared clean and well-defined Co3O4(111) films by physical vapor deposition in ultra-high vacuum (UHV) and transferred the samples into liquid environment without exposure to ambient conditions. We anchored MPTPP to Co3O4(111) in the liquid phase using two different solvents, namely ethanol and dichloromethane. After a second transfer step into an aqueous electrolyte (0.15 M ammonia buffer, pH 10), we investigated the interaction of the porphyrin with the oxide surface in a potential window from 0.3 to 1.3 V-RHE using electrochemical infrared reflection absorption spectroscopy (EC-IRRAS). We observed that MPTPP binds via the phosphonate group to the Co2+ surface ions in the form of chelating tridentate. The binding motif remains unchanged in the entire potential region studied. While the binding motif was independent of the solvent used for anchoring, a higher coverage of anchored porphyrins was observed when adsorbing from ethanol.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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