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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)4476-4482
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number11
DOIs
Publication statusPublished - 2009 Mar 19

Fingerprint

soft landing
Self assembled monolayers
Benzene
Landing
benzene
matrices
desorption
carboxyl group
Temperature programmed desorption
Experiments
Adsorption
adsorption
collisions
Sandwich structures
sandwich structures
infrared reflection
Chemisorption
Absorption spectroscopy
Gold
chemisorption

ASJC Scopus subject areas

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

Cite this

Soft-landing experiments of Cr(benzene)2 sandwich complexes onto a carboxyl-terminated self-assembled monolayer matrix. / Ikemoto, Kaori; Nagaoka, Shuhei; Matsumoto, Takeshi; Mitsui, Masaaki; Nakajima, Atsushi.

In: Journal of Physical Chemistry C, Vol. 113, No. 11, 19.03.2009, p. 4476-4482.

Research output: Contribution to journalArticle

Ikemoto, Kaori ; Nagaoka, Shuhei ; Matsumoto, Takeshi ; Mitsui, Masaaki ; Nakajima, Atsushi. / Soft-landing experiments of Cr(benzene)2 sandwich complexes onto a carboxyl-terminated self-assembled monolayer matrix. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 11. pp. 4476-4482.
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