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Interfacial Interactions between CoTPP Molecules and MgO(100) Thin Films

DOI: 10.1039/C7CP00442G DOI Help

Authors: Matthias Franke (Universitat Erlangen-Nurnberg) , Daniel Wechsler (Universitat Erlangen-Nurnberg) , Quratulain Tariq (Universitat Erlangen-Nurnberg) , Michael Röckert (Universitat Erlangen-Nurnberg) , Liang Zhang (Universitat Erlangen-Nurnberg) , Pardeep Kumar Thakur (Diamond Light Source) , Nataliya Tsud (Charles University, Prague) , Sofiia Bercha (Charles University, Prague) , Kevin Charles Prince (Sincrotrone Trieste; IOM) , Tien-lin Lee (Diamond Light Source) , Hans-peter Steinruck (Universitat Erlangen-Nurnberg) , Ole Lytken (Universitat Erlangen-Nurnberg)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Phys. Chem. Chem. Phys.

State: Published (Approved)
Published: April 2017

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.

Subject Areas: Materials, Chemistry

Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: Elettra