Chair of Physical Chemistry II, University Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany.
Departamento de Química Inorgánica, AnalíticayQuímica Física, Facultad de Ciencias ExactasyNaturales, INQUIMAE-CONICET, Universidad de Buenos Aires, Pabellón 2, Buenos Aires, C1428EHA, Argentina.
Chemistry. 2019 Oct 11;25(57):13197-13201. doi: 10.1002/chem.201902680. Epub 2019 Sep 13.
We have studied the adsorption and interfacial reactions of 2H-tetraphenylporphyrin (2HTPP) with cobalt-terminated Co O (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 Co O (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 TiO (110), where no self-metalation is observed at room temperature.
我们使用同步辐射 X 射线光电子能谱研究了 2H-四苯基卟啉（2HTPP）与钴终止的 CoO（111）和氧终止的 CoO（111）薄膜的吸附和界面反应。在 275 K 时，我们在两种表面上都发现了形成金属化物种（很可能是 CoTPP）的证据。在两种表面上，自金属化程度随温度升高而增加，直到 475 K 左右，金属化几乎完全。在 575 K 时，在可还原的钴终止 CoO（111）表面上卟啉覆盖率急剧下降，而在不可还原的氧终止 CoO（111）上则需要更高的温度。低温自金属化与在 MgO（100）表面上观察到的相似，但与在 TiO（110）上观察到的截然不同，在 TiO（110）上，在室温下观察不到自金属化。
