| Names | |
|---|---|
| Other names tantalum trichloride | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.033.611 |
| EC Number |
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| |
| |
| Properties | |
| Cl3Ta | |
| Molar mass | 287.30 g·mol−1 |
| Appearance | black-green |
| Melting point | 440 °C (824 °F; 713 K) decomposes[1] |
| yes | |
| Related compounds | |
Otheranions | Tantalum(III) bromide Tantalum(III) iodide |
Othercations | Niobium(III) chloride |
Related compounds | Ta6Cl15 Tantalum(IV) chloride Tantalum(V) chloride |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Tantalum(III) chloride ortantalum trichloride is anon-stoichiometric chemical compound with a range of composition from TaCl2.9 to TaCl3.1[2] Anionic and neutral clusters containing Ta(III) chloride include [Ta6Cl18]4− and [Ta6Cl14](H2O)4.[3]
Tantalum(III) chloride is formed by reducing tantalum(V) chloride with tantalum metal. this is done by heating tantalum(III) chloride to 305 °C, passing the vapour over tantalum foil at 600°, and condensing the trichloride at 365 °C. If the condensing region is kept at too high a temperature, then TaCl2.5 deposits instead.[5]
The trichloride can also be prepared by thermal decomposition of TaCl4, with removal of volatile TaCl5. TaCl5 can be vapourised leaving behind TaCl3.[6]
"Salt-free reduction" of a toluene solution of TaCl5 with 1,4-disilyl-cyclohexadiene in the presence ofethylene produces a complex of TaCl3:[7]
Above 500 °C, TaCl3 disproportionates further releasing TaCl5.[6] TaCl3 is insoluble in room temperature water, or dilute acid, but dissolves in boiling water. A blue-green solution is formed.[6]
Tantalum(III) chloride can form complexes with some ligands as a monomer or dimer.
Complexes include Ta(=C-CMe3)(PMe3)2Cl3, [TaCl3(P(CH2C6H5)3THF]2μ-N2 and [TaCl3THF2]2μ-N2 (dinitrogen complexes).[8]
As a dimer, complexes include Ta2Cl6(SC4H8)3 (SC4H8=tetrahydrothiophene). Ta2Cl6(SMe2)3, Ta2Cl6(thiane)3 and Ta2Cl6(thiolane)3 have a double bond between the two tantalum atoms, and two bridging chlorides, and a bridging ligand.[7]