Organolanthanoids .VIII. Some Ligand-Exchange Reactions of Pentafluorophenyllanthanoids and Bis(Phenylethynyl)Ytterbium(II)

Abstract

The cyclopentadienyl - and indenyl-lanthanoids, (C₅H₅)₂Yb( dme ) ( dme = 1,2- dimethoxyethane ), (C₉H₇)₂Yb( thf )₂ ( thf = tetrahydrofuran ), (C₅H₅)₂Eu( thf )_n (n = 0.5 or 1), (C₉H₇)₂Eu( thf ), (C₅H₅)₃Sm, (MeC₅H₄)₃Sm, and (C₉H₇)₃Sm( thf ) have been prepared by ligand exchange reactions of (C₆F₅)₂Yb, (C₆F₅)₂Eu, and a pentafluorophenylsamarium species with cyclopentadiene , methylcyclopentadiene , or indene. This synthetic method has particular significance for the indenyllanthanoids . An explosive product was obtained from (C₆F₅)₂Yb and methylcyclopentadiene. Reactions of ( PhCC )₂Yb with cyclopentadienes and indene have yielded (C₅H₅)₂Yb( dme ), (MeC₅H₄)₂Yb( dme ), and (C₉H₇)₂Yb( thf )₂, but (C₅H₅)₂Yb did not undergo ligand exchange with phenylacetylene.