Interfacial Reactions of Tetraphenylporphyrin with Cobalt-Oxide Thin Films
- Wechsler, Daniel
- Fernández, Cynthia Carolina
- Tariq, Quratulain
- Tsud, Nataliya
- Prince, Kevin C.
- Williams, Federico José
- Steinrück, Hans Peter
- Lytken, Ole
DOIAbstract
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) surface...
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