Reactions of free cyclopentadienyl radicals. 3 Metallocenes of samarium, europium, and ytterbium with the especially bulky cyclopentadienyl ligands C5H(CHMe2)4, C5H2(CMe3)3, and C5(CHMe2)5

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • Helmut Sitzmann - , University of Kaiserslautern-Landau (Author)
  • Thomas Dezember - , University of Kaiserslautern-Landau (Author)
  • Oliver Schmitt - , University of Kaiserslautern-Landau (Author)
  • Frank Weber - , University of Kaiserslautern-Landau (Author)
  • Gotthelf Wolmershäuser - , University of Kaiserslautern-Landau (Author)
  • Michael Ruck - , Karlsruhe Institute of Technology (Author)

Abstract

Octaisopropylmetallocenes of the lanthanoids Sm (1-Sm), Eu (1-Eu), and Yb (1-Yb) can be obtained easily from the diiodides of the rare earth elements. Like the hexa-(tert.-butyl)metallocenes 2-Sm, 2-Eu, and 2-Yb, they show no tendency towards coordination of donor solvent molecules or alkali salts. The decaisopropylmetallocenes 3-Sm, 3-Eu und 3-Yb have been synthesized from the metal and the free pentaisopropylcyclopentadienyl radical. The three europocenes 1-Eu, 2-Eu, and 3-Eu show fluorescence in daylight or under UV irradiation (336 nm). Crystalline 1-Eu and 2-Eu are bent sandwich complexes, whereas for the decaisopropyl derivative 3-Eu axial symmetry with parallel five-membered rings has been observed.

Details

Original languageEnglish
Pages (from-to)2241-2244
Number of pages4
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume626
Issue number11
Publication statusPublished - 2000
Peer-reviewedYes
Externally publishedYes

External IDs

ORCID /0000-0002-2391-6025/work/166325874

Keywords

ASJC Scopus subject areas

Keywords

  • Europocene, Fluorescence, Pentaisopropylcyclopentadienyl, Samarocene, Tetraisopropylcyclopentadienyl, Tri(tert.-butyl)cyclopentadienyl, Ytterbocene