Abstract
Attempts to reduce TaCl5 with KC8 or LiBH4 in the presence of lithium diphenylformamidinato (LiDPhF) or potassium pyridinethiolato (Kpyt) are described. At low temperature the reaction of TaCl5, KC8 and LiDPhF yields the mononuclear eight-coordinated compound Ta(DPhF)4 2 which was found to be isostructural with the niobium analog 1. At room temperature and in the presence of KC8 and Kpyt the isolated product was [K(THF)6][Ta(pyt)4] 3. Whenever the reactions were carried out with LiDPhF present in an excess of LiBH4, breakage of a C-N bond in the ligand occurred giving imido complexes, such as the mononuclear seven-coordinated Ta(NPh)(DPhF)3 4 or the dinuclear species Ta2(μ-NPh)2 (μ-DPhF)2(η2-DPhF)2 5. All compounds, 1-5, have been characterized by X-ray crystallographic methods and the results are presented here.
Original language | English |
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Pages (from-to) | 711-720 |
Number of pages | 10 |
Journal | Bulletin de la Societe Chimique de France |
Volume | 133 |
Issue number | 7-8 |
State | Published - 1996 |
Externally published | Yes |
Keywords
- Formamidinato
- Imido
- Pyridinethiolato
- Reduction
- Tantalum niobium