Europium(II) fluoride

Europium(II) fluoride
Names
	IUPAC name Europium(II) fluoride
	Other names Europium difluoride
Identifiers
CAS Number	14077-39-5 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	13834724;
ECHA InfoCard	100.203.721
PubChem CID	21225127;
CompTox Dashboard (EPA)	DTXSID00611473;
	InChI InChI=1S/Eu.2FH/h;2*1H/q+2;;/p-2 Key: YLDGIMHVWSTRML-UHFFFAOYSA-L;
	SMILES F[Eu]F; [F-].[F-].[Eu+2];
Properties
Chemical formula	EuF2
Molar mass	189.96
Appearance	dark yellowish solid[1]
Density	6.495 g·cm−3
Structure[2]
Crystal structure	Fluorite structure
Space group	Fm3m (No. 225)
Lattice constant	a = 584.23 pm
Formula units (Z)	4
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301
Precautionary statements	P264, P270, P301+P310, P321, P330, P405, P501
Related compounds
Other anions	Europium(II) bromide; Europium(II) chloride ; Europium(II) iodide
Other cations	Samarium(II) fluoride ; Thulium(II) fluoride ; Ytterbium(II) fluoride
Related compounds	Europium(III) fluoride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Europium(II) fluoride is an inorganic compound with a chemical formula EuF₂. It was first synthesized in 1937.[1]

Production

Europium(II) fluoride can be produced by reducing europium(III) fluoride with metallic europium or hydrogen gas.[3]

\mathrm {2\ EuF_{3}+Eu\longrightarrow 3\ EuF_{2}}

\mathrm {2\ EuF_{3}+H_{2}\longrightarrow 2\ EuF_{2}+2\ HF}

Properties

Europium(II) fluoride is a bright yellowish solid with a fluorite structure.[3]

EuF₂ can be used to dope a trivalent rare-earth fluoride, such as LaF₃, to create a vacancy-filled structure with increased conductivity over a pure crystal. Such a crystal can be used as a fluoride-specific semipermeable membrane in a fluoride selective electrode to detect trace quantities of fluoride.[4][5]

References

Zhao Yongzhi, Ma Ying, Hou Shaochun, Zhang Wenjuan, Wang Jingjing, Ding Yanrong, Hao Yifan. 氟化亚铕研究现状 (lit. Research Progress of Europium(II) Fluoride). Chinese Rare Earths, 2017. 38 (5): 134-140. (in Chinese)
Greis, Ortwin; Haschke, John M. (1982). "Chapter 45 Rare earth fluorides". Handbook on the Physics and Chemistry of Rare Earths Volume 5. Elsevier. pp. 387–460. doi:10.1016/s0168-1273(82)05008-9. ISSN 0168-1273.
Georg Brauer: Handbuch der Präparativen Anorganischen Chemie. 3., umgearb. Auflage. Band I. Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 255.
Light, Truman S.; Cappuccino, Carleton C. (April 1975). "Determination of fluoride in toothpaste using an ion-selective electrode". Journal of Chemical Education. 52 (4): 247–250. Bibcode:1975JChEd..52..247L. doi:10.1021/ed052p247. PMID 1133123.
Frant, Martin S.; Ross, James W. (23 December 1966). "Electrode for Sensing Fluoride Ion Activity in Solution" (PDF). Science. 154 (3756): 1553–1555. Bibcode:1966Sci...154.1553F. doi:10.1126/science.154.3756.1553. JSTOR 1720460. PMID 5924922. S2CID 11042445.

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[Zhao-1] Zhao Yongzhi, Ma Ying, Hou Shaochun, Zhang Wenjuan, Wang Jingjing, Ding Yanrong, Hao Yifan. 氟化亚铕研究现状 (lit. Research Progress of Europium(II) Fluoride). Chinese Rare Earths, 2017. 38 (5): 134-140. (in Chinese)

[2] Greis, Ortwin; Haschke, John M. (1982). "Chapter 45 Rare earth fluorides". Handbook on the Physics and Chemistry of Rare Earths Volume 5. Elsevier. pp. 387–460. doi:10.1016/s0168-1273(82)05008-9. ISSN 0168-1273.

[GB-3] Georg Brauer: Handbuch der Präparativen Anorganischen Chemie. 3., umgearb. Auflage. Band I. Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 255.

[4] Light, Truman S.; Cappuccino, Carleton C. (April 1975). "Determination of fluoride in toothpaste using an ion-selective electrode". Journal of Chemical Education. 52 (4): 247–250. Bibcode:1975JChEd..52..247L. doi:10.1021/ed052p247. PMID 1133123.

[5] Frant, Martin S.; Ross, James W. (23 December 1966). "Electrode for Sensing Fluoride Ion Activity in Solution" (PDF). Science. 154 (3756): 1553–1555. Bibcode:1966Sci...154.1553F. doi:10.1126/science.154.3756.1553. JSTOR 1720460. PMID 5924922. S2CID 11042445.