N 1s XPS spectra of a 2H-OEP multilayer before (a) and after (b) and (c) Fe deposition steps. The photon energy was hν = 530 eV. The formation of the peak at BE = 398.9 ± 0.05 eV gives evidence of the N–Fe coordination.
N 1s XPS spectra of a 2H-OEP ML before (a) and after (b)–(d) Fe deposition steps. The used photon energy was hν = 530 eV. The formation of the peak at BE = 398.7 ± 0.05 eV gives evidence of the N–Fe coordination.
N K-edge NEXAFS spectra of a multilayer (a) and (b) and a monolayer (c) and (d) before and after Fe metalation. Spectra were collected for θ = 90° and θ = 30° (where θ is the angle between the light polarization vector and the normal to the surface).
N K-edge NEXAFS spectrum of 2H-OEP molecules in gas phase (a). N 1s XPS spectra of 2H-OEP (continuous line) and 2H-TPP (dashed line) molecules in gas phase measured at hν = 500 eV (b). The inset shows the N 1s XPS spectra of 2H-OEP (continuous line) and 2H-TPP (dashed line) multilayers (4 layers) deposited on Ag(111). Data of the 2H-TPP multilayer are taken from Ref. 18 . A sketch of the molecular structures for 2H-OEP and 2H-TPP is shown on the top right side.
(Top panel) N 1s XPS spectrum of a 2H-OEP multilayer (a). This spectrum has been fitted with three components, one for –NH– (C, weighting about 50%) and two for the peak –N = (A and B, weighting roughly 25% each). (Bottom panel) N K-edge NEXAFS spectra of a 2H-OEP multilayer for θ = 30° (b) and θ = 90° (c). According to the fit procedure applied to (a), the NEXAFS spectra has been fitted using two components for the first π* transition (A and B) and one for the second π* peak (C).
Valence band spectra of 2H-OEP ML during Fe metalation (from (a) to (d)). The sequence of the ML valence band spectra are raw data subtracted by the valence band of the clean Ag surface taken in the same conditions. The photon energy was hν = 175 eV.
Formation of Fe-OEP multilayer on Ag(111): normalized intensity and BE of the N 1s components of XPS spectra in Fig. 1 .
Formation of Fe-OEP monolayer on Ag(111): normalized intensity, BE, and Doniach-Sunjic asymmetry of the N 1s components of the photoemission spectra in Fig. 1 .
Average tilt angles of the macrocycle with respect to the surface normal for multilayer and monolayer 2H-OEP films on Ag(111), before and after Fe evaporation. The average angles of Co-OEP monolayer on Ag(110) (NEXAFS measurements) and of 2H-OEP monolayer (calculations) are also reported from Ref. 23 .
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