SYNTHESIS AND CHARACTERIZATION OF SILAZOXY METALLACYCLES

Novel transition-metal-containing metallacycles of the type [{M[O(SiMe2NBut)2]}2] (M = Mn(II) 2, Fe(II) 3, Ni(II) 4 or Cr(II) 5) as well as six-membered heterocycles of the type O(SiMe2NBUt)2M (M = Te(II) 8, Ge(II) 9 or Sn(II) 10) have been synthesised by the reaction of O(SiMe2NButLi)2 with the corresponding metal halides. Reaction of CuCl2 and CuCl with O(SiMe2NButLi)2 yielded a novel copper amide [Cu4{O(SiMe2NBUt)2}2] 7 having four copper atoms in a square plane bridged symmetrically from above and below by the diamide ligand. This compound was also prepared by the reaction of O[SiMe2N(But)SnMe3], with CuCl2 and CuCl. X-Ray crystallographic data obtained are as follows: 2, triclinic, space group P1BAR, a = 8.550(2), b = 9.838(2), c = 11.668(2) angstrom, alpha = 83.81(3), beta = 70.35(3), gamma = 72.55(3)-degrees, Z = 1; 3, triclinic, space group P1BAR, a = 11.201(5), b = 11.579(4), c = 14.946(9) angstrom, alpha 1 06.90 (3), beta = 97.59 (2), gamma = 1 0 1 . 27 (2)-degrees, Z = 2.