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The Adsorption Structure of Cobalt Tetraphenylporphyrin on Ag(100)

DOI: 10.1021/acs.jpcc.7b00518 DOI Help

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

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: February 2017
Diamond Proposal Number(s): 525173

Abstract: Using a combination of LEED, high-resolution XPS, XSW and NEXAFS, we have studied the adsorption of cobalt(II) 5,10,15,20-tetraphenylporphyrin (CoTPP) on Ag(100) at 300 K. In agreement with previous studies on Ag(111), we find a charge transfer from the silver surface to the porphyrin molecule, reducing the metal center. At high coverages we observe a square-shaped 1.41 × 1.41 nm² adsorption structure, which becomes more open at lower coverages. Because of the superior energy resolution of the Diamond i09 beamline we are able to resolve a low-binding-energy shoulder in the C 1s spectrum, originating from the lower carbon atoms in the rotated phenyl rings. This is confirmed by XSW measurements, which also gives the adsorption heights of the other atoms in the molecule. In addition, the XSW and complementary NEXAFS measurements yield information about the rotation of the phenyl rings and the deformation of the macrocycle.

Subject Areas: Chemistry

Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: Elettra-Sincrotrone Trieste

Added On: 27/02/2017 09:50

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