Interfacial interactions between CoTPP molecules and MgO(100) thin films

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Franke M, Wechsler D, Tariq Q, Röckert M, Zhang L, Thakur PK, Tsud N, Bercha S, Prince K, Lee TL, Steinrück HP, Lytken O
Zeitschrift: Physical Chemistry Chemical Physics
Verlag: ROYAL SOC CHEMISTRY
Jahr der Veröffentlichung: 2017
Band: 19
Heftnummer: 18
Seitenbereich: 11549-11553
ISSN: 1463-9076
eISSN: 1463-9084


Abstract


We have investigated the interactions between cobalt(II)-tetraphenylporphyrin (CoTPP) molecules and MgO( 100) thin films on Ag(100) by means of Synchrotron Radiation X-Ray and Ultra-Violet Photoelectron Spectroscopy (SR-XPS and SR-UPS). At room temperature, the CoTPP monolayer consists of two different species. A minority of molecules exhibits a strong electronic interaction with the substrate, whereas for the majority a similar spectroscopic signature as for multilayer molecules is observed. Based on the lateral inhomogeneity of the surface electronic structure, we tentatively suggest that the strongly interacting molecules adsorb with their metal center directly above oxygen ions. Unlike for metal substrates, where a monolayer can be prepared upon heating to above 500 K, most of the monolayer on MgO desorbs at 550 K together with the multilayers. This indicates either a weaker molecule- substrate bond than for most metal surfaces or a higher activation energy barrier for dehydrogenation. The remaining molecules are presumably MgTPP molecules, originating from a 2HTPP impurity in CoTPP.



FAU-Autoren / FAU-Herausgeber

Franke, Matthias Dr.
Lehrstuhl für Physikalische Chemie II
Lytken, Ole
Lehrstuhl für Physikalische Chemie II
Röckert, Michael
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II
Tariq, Quratulain
Lehrstuhl für Physikalische Chemie II
Wechsler, Daniel
Lehrstuhl für Physikalische Chemie II
Zhang, Liang Dr.
Lehrstuhl für Physikalische Chemie II


Autor(en) der externen Einrichtung(en)
Diamond Light Source
Elettra Sincrotrone Trieste S.C.p.A.
Univerzita Karlova v Praze / Charles University in Prague


Zitierweisen

APA:
Franke, M., Wechsler, D., Tariq, Q., Röckert, M., Zhang, L., Thakur, P.K.,... Lytken, O. (2017). Interfacial interactions between CoTPP molecules and MgO(100) thin films. Physical Chemistry Chemical Physics, 19(18), 11549-11553. https://dx.doi.org/10.1039/c7cp00442g

MLA:
Franke, Matthias, et al. "Interfacial interactions between CoTPP molecules and MgO(100) thin films." Physical Chemistry Chemical Physics 19.18 (2017): 11549-11553.

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Zuletzt aktualisiert 2018-07-08 um 00:10