ORGANOMETAL COMPOUNDS OF LANTHANOIDS .76. CYCLOOCTATETRAENYL (TETRAMETHYLCYCLOPENTADIENYL) COMPLEXES OF LANTHANOIDS

The complexes [(C8H8)Ln(mu-Cl)(THF)n]2 (Ln = Y, La, Pr, Sm, Gd, Dy, Er , Lu) react with Na(C5Me4H) in THF to yield complexes (C8H8)Ln(C5Me4H) (THF)x (Ln = Y, La, Pr, Sm, Gd, Dv, Er, Lu). Crystals of (C8H8)La(C5Me 4H)(THF)2 (2) are monoclinic, space group P2(1)/n with a = 850.80(15), b = 1 183.5(2), c = 2290.1(5) pm, beta = 96.70(16)-degrees, V = 2273. 8(8) X 10(-30) m3 and Z = 4. Least-squares refinement on the basis of 3070 reflections (F(o) > 6sigma(F(o))) led to a final R of 0.0305. Com pound (C8H8)Lu(C5Me4H) (8) crystallizes monoclinic, space group P2(1)/ m with a = 927.6(2), b = 1431.3(4). c = 1114.4(2) pm, beta = 90.41(1)- degrees, V = 1479.5(5) x 10(-30) m3 and Z = 4. Least-squares refinemen t on the basis of 2329 reflections (F(o) > 4 sigma(F(o))) led to a fin al R of 0.0276.