L2,3-edges absorption spectra of a 2D complex system: a theoretical modelling
文献情報
S. Carlotto, M. Sambi, F. Sedona, A. Vittadini, J. Bartolomé, F. Bartolomé
L2,3-edges absorption spectra of FePc (I) and FePc(η2-O2) (II) on Ag(110) have been modelled using the DFT/ROCIS method. Despite disregarding the presence of the substrate, the agreement between experiment and theory is remarkable. Moreover, theoretical results confirm the fraction of II (70%) present on the surface, thus allowing a thorough assignment of each experimental spectral feature. Ground state (GS) theoretical outcomes pertaining to I and II provide an intimate understanding of the electron transfer pathway ruling the I-based catalytic oxygen reduction reaction. DFT/ROCIS outcomes indicate that the lower excitation energy (EE) side of the I/IIL3 intensity distributions mainly includes states having the GS number of unpaired electrons (two in I and six in II), whereas states with higher/lower spin multiplicity contribute to the I/IIL3 higher EE side. The occurrence of states involving metal to ligand charge transfer transitions implying low lying empty π* ligand-based orbitals on the I/IIL3 higher EE sides have been confirmed.
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