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

ASJC Scopus subject areas

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

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