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Metallocenes of Samarium, Europium, and Ytterbium with the Especially Bulky Cyclopentadienyl Ligands C 5 H(CHMe 2 ) 4 , C 5 H 2 (CMe 3 ) 3 , and C 5 (CHMe 2 ) 5
Author(s) -
Sitzmann Helmut,
Dezember Thomas,
Schmitt Oliver,
Weber Frank,
Wolmershäuser Gotthelf,
Ruck Michael
Publication year - 2000
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200011)626:11<2241::aid-zaac2241>3.0.co;2-0
Subject(s) - lanthanide , derivative (finance) , rare earth , crystallography , bent molecular geometry , alkali metal , europium , molecule , solvent , chemistry , materials science , luminescence , mineralogy , ion , business , organic chemistry , optoelectronics , finance
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.