Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 57, Pages 13197-13201Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902680
Keywords
ion exchange; metalation; oxide surfaces; porphyrins; protonation
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Funding
- National Council of Scientific and Technical Research (CONICET)
- German Research Council (DFG) [FOR 1878]
- Czech Ministry of Education [LM2015057]
- CERIC-ERIC consortium
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We have studied the adsorption and interfacial reactions of 2H-tetraphenylporphyrin (2HTPP) with cobalt-terminated Co3O4(111) and oxygen-terminated CoO(111) thin films using synchrotron-radiation X-ray photoelectron spectroscopy. Already at 275 K, we find evidence for the formation of a metalated species, most likely CoTPP, on both surfaces. The degree of self-metalation increases with temperature on both surfaces until 475 K, where the metalation is almost complete. At 575 K the porphyrin coverage decreases drastically on the reducible cobalt-terminated Co3O4(111) surface, while higher temperatures are needed on the non-reducible oxygen-terminated CoO(111). The low temperature self-metalation is similar to that observed on MgO(100) surfaces, but drastically different from that observed on TiO2(110), where no self-metalation is observed at room temperature.
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