COMPARISON OF ISOELECTRONIC CYCLOPENTADIENYL, INDENYL, AND HYDROTRIS(3,5-DIMETHYLPYRAZOLYL)BORATE COMPLEXES OF OSMIUM(VI)

Osmium(VI) complexes with cyclopentadienyl, indenyl, and hydrotris(3,5 -dimethyl-pyrazolyl)borate ligands result from the reaction between [O s(N)Ph-2(py)(2)][BF4] and sodium cyclopentadienide, potassium indenide , or potassium hydrotris(3,5-dimethylpyrazolyl)borate. The molecular s tructures of the resulting complexes, CpOs(N)Ph-2 (1), InOs(N)Ph-2 (2) , and TpOs(N)Ph-2 (3), have been determined by X-ray diffraction anal ysis. The cyclopentadienyl-type ligand in each complex is distorted du e to the strong trans effect of the nitrido group.