Adsorbed states of iron(II) phthalocyanine on Ag(111) studied by high-Resolution electron energy loss spectroscopy

Naoka Ohta, Ryuichi Arafune, Noriyuki Tsukahara, Noriaki Takagi, Maki Kawai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We investigated the adsorption states of iron(II) phthalocyanine (FePc) molecules on Ag(111) by using high-resolution electron energy loss spectroscopy (HREELS). The HREELS spectra were taken as a function of the coverage of FePc. At 1 monolayer, vibrational modes assigned as A2u and A1g representations were observed mainly by the dipole scattering mechanism, which indicates that the first-layer molecules adsorb with the molecular planes parallel to the surface. The vibration associated with the motion of the central Fe2+ ion perpendicular to the molecular plane shows a considerable shift of the vibration energy. This reflects significant bonding interactions between the FePc molecule and the substrate. In the high coverage regime, multilayers were grown, and the vibration modes attributed to not only A2u but also Eu representation were observed. The FePc molecules in the upper layers tilt the molecular planes to the substrate. The vibrational energy is almost identical to those in the gas phase, indicating weaker interactions between the molecules.

Original languageEnglish
Pages (from-to)1253-1256
Number of pages4
JournalSurface and Interface Analysis
Volume46
Issue number12-13
DOIs
Publication statusPublished - 2014 Dec 1

Keywords

  • Adsorption configuration
  • Ag(111)
  • High-resolution electron energy loss spectroscopy
  • Iron phthalocyanine
  • Molecule-substrate interaction
  • Thin film
  • Vibrational spectra

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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