Abstract
A reaction between YCl 3 and excess sodium cyclopentadienide in THF solution followed by crystallization from this solvent affords (η 5-C 5H 5) 3 Y · OC 4H 8 in 68% yield. The corresponding lanthanum complex (η 5-C 5H 5) 3La · OC 4H 8 can be obtained from LaCl 3 and C 5H 5Na in 76% yield via a similar procedure. The products have been characterized by their proton NMR and mass spectra, and by single crystal X-ray diffraction investigations. (η 5-C 5H 5) 3Y · OC 4H 8[η 5-C 5H 5) 3 La · OC 4H 8] crystallizes in the monoclinic space group P2 1/ n[ P2 1/ n] with unit cell parameters a 8.170(3) [8.371(4)], b 24.594(5) [24.636(5)], c 8.260(3) [8.454(3)] Å, β 101.32(3) [101.84(3)]°, D c 1.45 [1.58] g cm -3 for Z 4 [4]. Least-squares refinement has led to a final R value of 0.041 [0.088] based on 1992 [2193] independent observed reflections. The THF molecule is coordinated to the yttrium [lanthanum] atom at a YO(LaO) bond length of 2.451(4) [2.57(1)] Å. The YC(Cp)[LaC(Cp)] bond distances average 2.71(3) [2.82(4)] Å. The title compounds are isostructural with (η 5-C 5H 5) 3Gd · OC 4H 8.
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