Preparation and Molecular Structure of TaH(P(C6H5)2)2(Me2PC2H4Me2)2, a Metal Hydride of the type MHL2(Bidentate Phosphine)2(n+), Having a Pentagonal Bipyramidal Structure.
Abstract
Treatment of TaCl2(dmpe)2 (dmpe = 1,2-bis(dimethylphosphino)ethane) with K(PPh2).2 dioxane affords a seven-coordinate, Ta(III) hydride, TaH(PPh2)2)-(dmpe)2. Crystals of the complex are triclinic, space group P1, with a = 10.556(3) Angstrom, b = 11.175(3) Angstrom, c = 18.663(5) Angstrom, alpha = 76.00(3) deg, beta = 74.48(3) deg, gamma = 66.60(3) deg. Full-matrix least squares refinement of positional and thermal parameters for all nonhydrogen atoms (including fixed contributions for phenyl H atoms) led to R = 0.077 and R (omega) = 0.093. The molecular structure of the complex consists of a well-defined pentagonal bipyramid, with apical, monodentate PPh2 moieties, and two dmpe ligands plus a hydride ion in the pentagonal plane. The hydride ion was not refined, but its position was inferred from a peak on a final difference map, as well as from large P-Ta-P angle distortions in the pentagonal plane. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADA078700
Entities
People
- Bruce M. Foxman
- P. J. Domaille
- S. S. Wreford
- T. J. Mcneese
Organizations
- Brandeis University