ORGANOMETALLIC COMPOUNDS OF THE LANTHANIDES .68. REDUCTION OF VANADIUM(II) TO VANADIUM(0) BY NAPHTHALENEYTTERBIUM - SYNTHESIS AND X-RAY CRYSTAL-STRUCTURE OF THE 2-DIMENSIONAL MULTIDECKER COMPLEX [(ETA-5-C5H5)V(MU-ETA-6-ETA-2-C10H8)YB(THF)-(ETA-5-C5H5)]N

The reaction of (C5H5)2V with an excess of (C10H8)Yb(THF)2 in tetrahydrofuran at room temperature generated the polymeric two-dimensional multidecker complex [(eta5-C5H5)V(mu-eta6:eta2-C10H8)Yb(THF)(eta5-C5H5)]n (1), which is also obtained from the reaction of YbI2(THF)2 with an equimolar mixture of KC5H5 and K[(C5H5)V(C10H8)] in tetrahydrofuran. The new compound was characterized by elemental analyses, magnetic susceptibility, IR and ESR spectra. The X-ray structural analysis of 1 showed the compound to be monoclinic, space group C2/c, Z = 8, with a = 19.07(5), b = 13.61(3), c = 17.40(3) angstrom, beta = 91.9(2)-degrees and D(calc) = 1.84 g cm-3. The structure was solved from 2482 observed reflections with F(o) > 4sigma(F(o)) and refined to a final R value of 0.047. The molecular structure consists of infinite zig-zag chains formed by (eta5-C5H5)Yb Moieties and with one (eta5-C5H5)V(eta6-C10H8) unit coordinated eta2 via the naphthalene to each Yb atom.