The fluoronickelates are a class of chemical compounds containing an anion with nickel at its core, surrounded by fluoride ions which act as ligands. This makes it a fluoroanion. The nickel atom can be in a range of oxidation states from +2, +3 to +4. The hexafluoronickelate(IV) ion NiF6 contains nickel in the maximal +4 state, and is in octahedral coordination by the fluoride atoms. It forms a commercially available salt Potassium hexafluoronickelate(IV) K2NiF6. Solid double salts can also contain tetrafluoronickelate NiF4 eg K2NiF4.
| formula | name | Ni Ox | structure | Remarks | references |
|---|---|---|---|---|---|
| (NH4)2NiF4 | ammonium tetrafluoronickelate | 2 | Fuse NiCl2 with NH4F, light green color | ||
| (NH4)2NiF4·2H2O | ammonium tetrafluoronickelate dihydrate | 2 | Formed from Ni(OH)2 and NH4F in water | ||
| K2NiF4 | potassium tetrafluoronickelate | 2 | |||
| Rb2NiF4 | rubidium tetrafluoronickelate | 2 | |||
| Ba2NiF6 | barium nickel fluoride | 2 | yellow square plates cas=18115-49-6 | ||
| Pb2NiF6 | lead(II)nickel(II) fluoride | 2 | cas=27037-78-1 | ||
| Li3NiF6 | 3 | Pna2 C2v a=9.60 Å b=8.37 Å c=4.09 Å Z=4 density=3.27 / 3.24 | formed at 500° 70 bar F2 | ||
| Na3NiF6 | sodium hexafluoronickelate | 3 | violet cas=22707-99-9 | ||
| K3NiF6 | potassium hexafluoronickelate | 3 | violet cas=14881-07-3 | ||
| KCs2NiF6 | dicesium potassium hexafluoronickelate | 3 | lilac colour cas=53479-35-9 | ||
| Li2NiF6 | lithium hexafluoronickelate | 4 | hexagonal a=8.321 Å c=4.598 Å V=275.7 Å Z=3 | pink sol 0.5 g/100 g HF at 0° | |
| (O2)2NiF6 | dioxygenyl hexafluoronickelate | possibly existing, decompose 10° | |||
| (NO2)2NiF6 | dinitronium hexafluoronickelate | 4 | ΔH=-471 kJ/mol, ΔHf=-1120 | ||
| Na2NiF6 | sodium hexafluoronickelate | 4 | cubic; or tetragonal | purple red | |
| K2NiF6 | potassium hexafluoronickelate | 4 | K2PtCl6 structure | red cas=17218-47-2 | |
| CaNiF6 | calcium hexafluoronickelate | 4 | ΔH=-363 kJ/mol, ΔHf=-1951 kJ/mol sold as a fluorine source | ||
| Rb2NiF6 | rubidium hexafluoronickelate | 4 | K2PtCl6 structure | red cas=17218-48-3 | |
| Cs2NiF6 | Cesium hexafluoronickelate | 4 | K2PtCl6 structure | red cas=17218-49-4 | |
| SrNiF6 | strontium hexafluoronickelate | 4 | red cas=66456-12-0 | ||
| BaNiF6 | barium hexafluoronickelate | 4 | K2PtCl6 structure | red cas=66456-13-1 | |
| (NF4)2NiF6 | bis-tetrafluoroammonium hexafluoronickelate | 4 | tetragonal K2PtCl6 structure | red cas=63105-40-8 | |
| (ClF2O)NiF6 | bis hexafluoronickelate (IV) | 4 | deep purple, stable to 60 °C |
References
- ^ Chaudhuri, Mihir K.; Ghosh, Soumitra K.; Hiese, Zavei (1984). "Synthesis of tetrafluoronickelate(II) and tetrafluorozincate(II) complexes from aqueous media: a novel route to fluorometalates" (PDF). Journal of the Chemical Society, Dalton Transactions (8): 1763. doi:10.1039/DT9840001763.
- Handbook of inorganic substances 2017
- Mellor, J. W. (May 1936). "Nickel". A COMPREHENSIVE TREATISE ON INORGANIC AND THEORETICAL CHEMISTRY VOLUME XV Ni Ru, Rh Pd, Os, Ir. p. 404. Retrieved 31 May 2016.
- ^ Macintyre, Jane E. (1992-07-23). Dictionary of Inorganic Compounds. CRC Press. p. 3222. ISBN 9780412301209. Retrieved 25 April 2016.
- ^ Whalen, J.M.; Lucier, G.M.; Chacón, L.; Bartlett, N. (March 1998). "The room temperature conversion of nickel difluoride to hexafluoronickelate(IV) salts of alkali cations". Journal of Fluorine Chemistry. 88 (2): 107–110. Bibcode:1998JFluC..88..107W. doi:10.1016/S0022-1139(98)00105-5.
- Grannec, J.; Lozano, L.; Sobre, P.; Portier, J.; Hagenmuller, P. (September 1975). "Sur un nouvel hexafluorure de nickel trivalent de formule Li3NiF6". Journal of Fluorine Chemistry (in French). 6 (3): 267–274. doi:10.1016/S0022-1139(00)83005-5.
- ^ Chacon, Lisa Carine (December 1997). "The Synthesis, Characterization and Reactivity of High Oxidation State Nickel Fluorides" (PDF). Berkeley California: University of California. Retrieved 27 April 2016.
- Bougon, Roland A.; Christe, Karl O.; Wilson, William W. (November 1985). "Dioxygenyl salts containing doubly charged mononuclear counterions". Journal of Fluorine Chemistry. 30 (2): 237–239. Bibcode:1985JFluC..30..237B. doi:10.1016/S0022-1139(00)80892-1.
- Marx, Rupert; Seppelt, Konrad (2015). "Structure investigations on oxygen fluorides". Dalton Trans. 44 (45): 19659–19662. doi:10.1039/C5DT02247A. PMID 26351980.
- ^ Vorobyov, A.F.; Solovyov, S.N.; Minasian, K.A.; Dupal, A.Ja.; Sokolov, V.B.; Spirin, S.N. (September 1991). "Thermochemistry of certain hexafluorometalates and tetrafluoroborates". Journal of Fluorine Chemistry. 54 (1–3): 333. Bibcode:1991JFluC..54..333V. doi:10.1016/S0022-1139(00)83842-7.
- ^ Macintyre, Jane E. (1992-07-23). Dictionary of Inorganic Compounds. CRC Press. p. 3223. ISBN 9780412301209. Retrieved 25 April 2016.
- Foulds, G.A. (February 1990). "1. Nickel". Coordination Chemistry Reviews. 98: 2. doi:10.1016/0010-8545(90)80069-6.
- Wilson, William W.; Christe, Karl O. (September 1984). "Synthesis and characterization of bis hexafluoronickelate(IV), (ClF2O)2NiF6". Inorganic Chemistry. 23 (20): 3261–3262. doi:10.1021/ic00188a048.
| Nickel compounds | |
|---|---|
| Nickel(0) | |
| Nickel(II) | |
| Nickel(III) | |
| Nickel(IV) | |