Potassium tetrafluoronickelate

Potassium tetrafluoronickelate
Identifiers
CAS Number	13859-60-4;
3D model (JSmol)	Interactive image;
ChemSpider	21160197;
EC Number	237-595-3;
PubChem CID	44149288;
CompTox Dashboard (EPA)	DTXSID90930160;
	InChI InChI=1S/4FH.2K.Ni/h41H;;;/q;;;;2+1;+2/p-4 Key: UIRGKRRTSXFSTG-UHFFFAOYSA-J;
	SMILES F(F)(F)F..;
Properties
Chemical formula	F4K2Ni
Molar mass	212.8836 g·mol−1
Appearance	green solid
Density	3.36 g/cm3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Potassium tetrafluoronickelate is the inorganic compound with the formula K₂NiF₄. It features octahedral (high spin) Ni centers with Ni-F bond lengths of 2.006 Å. This green solid is a salt of tetrafluoronickelate. It is prepared by melting a mixture of nickel(II) fluoride, potassium fluoride, and potassium bifluoride.^[1] The compound adopts a perovskite-like structure consisting of layers of octahedral Ni centers interconnected by doubly bridging fluoride ligands. The layers are interconnected by potassium cations. It is one of the principal Ruddlesden-Popper phases. Early discoveries on cuprate superconductors focused on compounds with structures closely related to K₂NiF₄, e.g. lanthanum cuprate and derivative lanthanum barium copper oxide.

References

^ Yeh, S. K.; Wu, S. Y.; Lee, C. S.; Wang, Y. (1993). "Electron-Density Distribution in a Crystal of Potassium Tetrafluoronickelate, K₂NiF₄". Acta Crystallographica Section B: Structural Science. 49 (5): 806–811. doi:10.1107/S0108768193003246.

Zdroj:https://en.wikipedia.org?pojem=Potassium_tetrafluoronickelate
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[1] Yeh, S. K.; Wu, S. Y.; Lee, C. S.; Wang, Y. (1993). "Electron-Density Distribution in a Crystal of Potassium Tetrafluoronickelate, K₂NiF₄". Acta Crystallographica Section B: Structural Science. 49 (5): 806–811. doi:10.1107/S0108768193003246.

[1]

v t e Nickel compounds
Nickel(0)	Ni(CO)₄ Ni(COD)₂
Nickel(II)	NiF₂ K₂NiF₄ NiF²⁻ ₄ NiCl₂ NiCl²⁻ ₄ NiBr₂ NiBr²⁻ ₄ NiI₂ NiI²⁻ ₄ Ni(CN)₂ K₂Ni(CN)₄ Ni(SCN)₂ NiO Ni(OH)₂ NiCO₃ NiSO₄ Ni₃(PO₄)₂ NiCrO₄ NiTiO₃ NiSeO₄ NiS NiSe Ni(ClO₄)₂ Ni(NO₃)₂ Ni(NO₂)₂ Ni(NO₂)³⁻ ₅ / Ni(NO₂)⁴⁻ ₆ C ₂₄H ₄₆NiO ₄ C ₃₆H ₇₀NiO ₄ Ni(acac)₂
Nickel(III)	NiF₃ Ni₂O₃ NiOOH
Nickel(IV)	NiF₄ K₂NiF₆ MNiO_$x$

Identifiers

CAS Number	13859-60-4
3D model (JSmol)	Interactive image
ChemSpider	21160197
EC Number	237-595-3
PubChem CID	44149288
CompTox Dashboard (EPA)	DTXSID90930160
InChI InChI=1S/4FH.2K.Ni/h41H;;;/q;;;;2+1;+2/p-4 Key: UIRGKRRTSXFSTG-UHFFFAOYSA-J
SMILES F(F)(F)F..
Properties
Chemical formula	F₄K₂Ni
Molar mass	212.8836 g·mol⁻¹
Appearance	green solid
Density	3.36 g/cm³
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references