Formation and electronic structures of organoeuropium sandwich nanowires

Natsuki Hosoya, Ryuta Takegami, Jun Ichi Suzumura, Keizo Yada, Ken Miyajima, Masaaki Mitsui, Mark B. Knickelbein, Satoshi Yabushita, Atsushi Nakajima

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Organoeuropium sandwich clusters, comprising europium (Eu) and 1,3,5,7-cyclooctatetraene (COT) (Eun(COT)m), were produced in the gas phase using a laser vaporization synthesis method. Photoionization mass spectra revealed an exclusive Eun(COT)m formation with three compositions: m = n + 1, m = n, and m = n - 1, which, we propose, correspond to full-sandwich, half-sandwich, and inverted-sandwich structures, respectively. The charge distributions, metal-ligand bonding characteristics, and electronic structures of the clusters were comprehensively investigated by photoionization measurements of Eun(COT)m neutrals and by photoelectron spectroscopy of Eun(COT)m - and isoelectronic Ban(COT)m - anions. The results confirmed that (1) highly ionic metal-ligand bonding is formed between Eu2+ and COT2- within the sandwich structure (at the termini, ionic forms are Eu+ and COT-) and (2) size dependence of orbital energy can be explained by the Coulombic interaction of simple point charge models between the detaching electrons and dipoles/quadrupoles. When the terminus of the sandwich clusters is Eu2+, COT2-, or Eu0, the orbital energy of the electron detachment channel at the opposite terminus strongly depends on the cluster size. In this case, the molecular stack behaves as a one-dimensionally aligned dipole; otherwise, it behaves as a quadrupole, and the relationship between cluster size and electron detachment energy is much weaker. The study also reports on the 4f orbital energy in Eu ions and the formation mechanism of organoeuropium sandwich nanowires up to 12 nm in length. The nanowires are formed by successive charge transfer at the terminal part, Eu+ and COT-, which reduces the ionization energy and increases the electron affinity, respectively.

Original languageEnglish
Pages (from-to)8298-8308
Number of pages11
JournalJournal of Physical Chemistry A
Volume118
Issue number37
DOIs
Publication statusPublished - 2014 Sep 18

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Nanowires
Electronic structure
europium
nanowires
Europium
electronic structure
sandwich structures
detachment
orbitals
photoionization
Photoionization
quadrupoles
Sandwich structures
energy
dipoles
ligands
electrons
Electrons
electron affinity
Metals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Hosoya, N., Takegami, R., Suzumura, J. I., Yada, K., Miyajima, K., Mitsui, M., ... Nakajima, A. (2014). Formation and electronic structures of organoeuropium sandwich nanowires. Journal of Physical Chemistry A, 118(37), 8298-8308. https://doi.org/10.1021/jp5011007

Formation and electronic structures of organoeuropium sandwich nanowires. / Hosoya, Natsuki; Takegami, Ryuta; Suzumura, Jun Ichi; Yada, Keizo; Miyajima, Ken; Mitsui, Masaaki; Knickelbein, Mark B.; Yabushita, Satoshi; Nakajima, Atsushi.

In: Journal of Physical Chemistry A, Vol. 118, No. 37, 18.09.2014, p. 8298-8308.

Research output: Contribution to journalArticle

Hosoya, N, Takegami, R, Suzumura, JI, Yada, K, Miyajima, K, Mitsui, M, Knickelbein, MB, Yabushita, S & Nakajima, A 2014, 'Formation and electronic structures of organoeuropium sandwich nanowires', Journal of Physical Chemistry A, vol. 118, no. 37, pp. 8298-8308. https://doi.org/10.1021/jp5011007
Hosoya N, Takegami R, Suzumura JI, Yada K, Miyajima K, Mitsui M et al. Formation and electronic structures of organoeuropium sandwich nanowires. Journal of Physical Chemistry A. 2014 Sep 18;118(37):8298-8308. https://doi.org/10.1021/jp5011007
Hosoya, Natsuki ; Takegami, Ryuta ; Suzumura, Jun Ichi ; Yada, Keizo ; Miyajima, Ken ; Mitsui, Masaaki ; Knickelbein, Mark B. ; Yabushita, Satoshi ; Nakajima, Atsushi. / Formation and electronic structures of organoeuropium sandwich nanowires. In: Journal of Physical Chemistry A. 2014 ; Vol. 118, No. 37. pp. 8298-8308.
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