Molecular orientation and electronic states of vanadyl phthalocyanine on Si(111) and Ag(111) surfaces

Keitaro Eguchi, Yasumasa Takagi, Takeshi Nakagawa, Toshihiko Yokoyama

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We have investigated the molecular orientation and electronic structures of nonplanar vanadyl phthalocyanine (VOPc) on the Si(111)-(7 × 7) and Ag(111) surfaces by X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism. The VOPc molecule adsorbs on Ag(111) in a parallel orientation to the surface with an oxygen-up configuration. A strong interaction between the N and C atoms of VOPc and surface Ag atoms is observed at the interface, although no marked change in the electronic state is observed for the V atom, similarly to the case for VOPc in a multilayer. On the other hand, the chemical interaction of the O atom of VOPc with the surface Si atoms favors the oxygen-down configuration. This chemical interaction causes the cleavage of the Vî-O π bond and facilitates electron charge transfer to the V-N-C molecular orbitals. Such intermediation of the oxygen atom between the V atom and Si surface suppresses the direct interaction between them, and the spin magnetic moment of V remains the same as that of bulk VOPc molecules.

Original languageEnglish
Pages (from-to)22843-22851
Number of pages9
JournalJournal of Physical Chemistry C
Volume117
Issue number44
DOIs
Publication statusPublished - Nov 7 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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