Reaction of YbCp2(DME) (Cp = cyclopentadienyl; DME = 1,2-dimethoxyethane) with MCl2 (M = Hg, Cd, Zn, Pb, Sn, Cu, Pd, or Co) or MCl (M = Ag, Cu or Tl) in tetrahydrofuran (THF) gives the metal M and YbCp2Cl(THF)0.5, generally in excellent yield, with small amounts of TlCp and CoCp2 also detected from TlCl and CoCl2 respectively. Similarly, YbCp2X(THF) (X = Br or I) and YbCp2Cl(DME)0.5 have been prepared in good yields by analogous oxidation with suitable mercury(II) halides. However YbCp2(DME) and FeCl3 yield ferrocene. In simpler syntheses, YbCp2X(THF)n (X = Cl, n = 0.5; X = Br or I, n = 1) have been obtained by reactions of YbCp2(DME) with C2Cl6 or (CH2X)2 (X = Br or I) in THF, and (YbCp2X)2 by analogous reactions of unsolvated YbCp2 in petroleum ether. The X-ray crystal structure of YbCp2I(THF) (monoclinic, P21/c, a = 8.147(1), b = 13.788(2), c = 14.149(3)Å, β = 105.56(1)°, Z = 4, R = 0.042, for 2324 observed data) shows the complex to be monomeric with formal eight coordination for ytterbium, and with a pseudo-tetrahedral array of the centroids of the Cp rings, oxygen, and iodine ( 2.565 Å, Yb-O 2.311(5)Å, Yb-I 2.9316(7)Å).
|Number of pages||8|
|Journal||Journal of Organometallic Chemistry|
|Publication status||Published - 15 Nov 1996|
- Crystal structure
- Rare earth