BIS(TRIMETHYLSILYL)AMIDES AND BIS(TRIMETH YLSILYL)METHANIDES OF YTTRIUM - MOLECULAR-STRUCTURES OF U-CHLORO)-TRIS[BIS(TRIMETHYLSILYL)METHYL]YTTRIATE, SOLVENT-FREE YTTRIUM TRIS[BIS(TRIMETHYLSILYL)AMIDE] AS WELL AS THE BIS(BENZONITRILE) COMPLEX

The reaction of yttrium(III) chloride with the threefold molar amount of LiE(SiMe(3))(2) (E = N, CH) yields the corresponding yttrium deriva tives. Yttrium tris-[bis(trimethylsilyl)amide] crystallizes in the spa ce group P $($) over bar$$ 31c with a = 1636,3(2), c = 849,3(2)pm, Z = 2. The yttrium atom is surrounded trigonal pyramidal by three nitroge n atoms with Y-N-bond lengths of 222 pm. Benzene molecules are incorpo rated parallel to the c-axes. The compound with E = CH crystallizes as a (Et(2)O)(3)LiCl-adduct in the monoclinic space group P2(1)/n with a = 1111,8(2), b = 1865,2(6), c = 2598,3(9) pm, beta = 97,41(3)degrees and Z = 4. The reaction of yttrium tris[bis(trimethylsilyl)amide] with benzonitrile yields the bis(benzonitrile) complex, which crystallizes in the triclinic space group P $($) over bar$$ 1 with a = 1173,7(2), b = 1210,3(2), c = 1912,4(3) pm, alpha = 94,37(1), beta = 103,39(1), g amma = 117,24(1)degrees and Z = 2. The amido ligands are in equatorial , the benzonitrile molecules in axial positions.