Soft-landing experiments of Cr(benzene)2 sandwich complexes onto a carboxyl-terminated self-assembled monolayer matrix

Kaori Ikemoto, Shuhei Nagaoka, Takeshi Matsumoto, Masaaki Mitsui, Atsushi Nakajima

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Gas-phase synthesized Cr(benzene)2 sandwich complexes were soft-landed onto a carboxyl-terminated selfassembled monolayer (C 15COOH-SAM) on a gold substrate at hyperthermal collision energy (5-20 eV). The deposition process and adsorption properties of the soft-landed complexes were investigated by means of infrared reflection absorption spectroscopy (IRAS) and temperature programmed desorption (TPD) measurements. With the soft-landing, the Cr(benzene)2 complexes are adsorbed at the SAM surface while keeping their native sandwich structure intact even after the hyperthermal collision event. Moreover, the complexes tend to orient their molecular axes reasonably or comparatively close to the surface normal direction to the SAM surface. This orientation might arise from chemical interactions between the benzene ring in the sandwich complexes and carboxyl groups on the SAM surface. An Arrhenius analysis of the TPD spectra reveals the desorption activation energy of soft-landed complexes as 133 ± 10 kJ/mol, a value which is comparable to typical adsorption heat of chemisorptions. Chemical interactions between the Cr(benzene)2 complexes and carboxyl groups would provide firm trapping of the complexes at the SAM surface, preventing the supported complexes from being desorbed until near room temperature.

本文言語English
ページ(範囲)4476-4482
ページ数7
ジャーナルJournal of Physical Chemistry C
113
11
DOI
出版ステータスPublished - 2009 3 19

ASJC Scopus subject areas

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

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