Physical properties of mononuclear organoeuropium sandwich complexes ligated by cyclooctatetraene and bis(trimethylsilyl)cyclooctatetraene

Takashi Tsuji, Suguru Fukazawa, Rion Sugiyama, Kenshiro Kawasaki, Takeshi Iwasa, Hironori Tsunoyama, Norihiro Tokitoh, Atsushi Nakajima

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Mononuclear organoeuropium sandwich complexes were synthesized from ligands of 1,3,5,7-cyclooctatetraene (COT) and 1,4- and 1,6-bis(trimethylsilyl)- cyclooctatetraenes (COT″) in a liquid ammonia of europium (Eu) and lithium (Li). Elemental analyses revealed the chemical compositions as [(DME)Li] 2Eu(COT)2 (1) and [(DME)Li]2Eu(COT″) 2 (2). Vibrational analyses and magnetic measurements revealed a ligand-Eu-ligand sandwich structure. The Eu2+ ions induce paramagnetic behaviors at 6-300 K. Although UV-irradiated 1 and 2 emit light of similar color, the quantum yields of their toluene solution widely differ (2.4% and 21%, respectively). The effects of the trimethylsilyl group are evaluated from quantum chemical calculations.

Original languageEnglish
Pages (from-to)144-150
Number of pages7
JournalChemical Physics Letters
Volume595-596
DOIs
Publication statusPublished - 2014 Mar 18

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Lithium
Europium
Physical properties
lithium
physical properties
europium
Ligands
ligands
liquid ammonia
Sandwich structures
sandwich structures
Magnetic variables measurement
Toluene
Quantum yield
Ammonia
magnetic measurement
toluene
chemical composition
Ions
Color

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Physical properties of mononuclear organoeuropium sandwich complexes ligated by cyclooctatetraene and bis(trimethylsilyl)cyclooctatetraene. / Tsuji, Takashi; Fukazawa, Suguru; Sugiyama, Rion; Kawasaki, Kenshiro; Iwasa, Takeshi; Tsunoyama, Hironori; Tokitoh, Norihiro; Nakajima, Atsushi.

In: Chemical Physics Letters, Vol. 595-596, 18.03.2014, p. 144-150.

Research output: Contribution to journalArticle

Tsuji, Takashi ; Fukazawa, Suguru ; Sugiyama, Rion ; Kawasaki, Kenshiro ; Iwasa, Takeshi ; Tsunoyama, Hironori ; Tokitoh, Norihiro ; Nakajima, Atsushi. / Physical properties of mononuclear organoeuropium sandwich complexes ligated by cyclooctatetraene and bis(trimethylsilyl)cyclooctatetraene. In: Chemical Physics Letters. 2014 ; Vol. 595-596. pp. 144-150.
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AU - Kawasaki, Kenshiro

AU - Iwasa, Takeshi

AU - Tsunoyama, Hironori

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