| Popis: |
The crystal structure of the title compound, W(Me) 4 [ON(Me)NO] 2 , has been determined from three-dimensional X-ray data. The crystals are orthorhombic, with unit-cell dimensions a = 13.033, b = 14.825, c = 12.954 A; space group is Pbca and Z = 8. Full-matrix least-squares refinement, using 818 independent reflections, has reached R 0.073. The complex is monomeric and the eight-coordinate tungsten atom is bonded to four methyl groups and to the oxygen atoms of two bidentate N -methyl- N -nitrosohydroxylaminato ligands. The coordination geometry is intermediate between squareantiprismatic and dodecahedral, and the mean W-C and W-O distances are 2.15 and 2.07 A respectively. The N -methyl groups in the two chelate rings adopt a cis configuration so that the molecule has almost perfect m symmetry. |
