Nickel(II) fluoride

<h2 id="preparation-and-structure">Preparation and structure</h2>
<p>NiF2 is prepared by treatment of anhydrous <a href="/facts/Nickel(II)_chloride/KWLuUr0V">nickel(II) chloride</a> with <a href="/facts/Fluorine/YUV0Fb8m">fluorine</a> at 350 °C:<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a>
</p>
NiCl2  +  F2  →  NiF2  +  Cl2
<p>The corresponding reaction of <a href="/facts/Cobalt(II)_chloride/qAAn3wNU">cobalt(II) chloride</a> results in <a href="/facts/Oxidation/Pyd5RVcj">oxidation</a> of the <a href="/facts/Cobalt/gqhScEw4">cobalt</a>, whereas nickel remains in the +2 <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> after fluorination because its +3 oxidation state is less stable. Chloride is more easily oxidized than nickel(II). This is a typical halogen displacement reaction, where a halogen plus a less active halide makes the less active halogen and the more active halide.
</p><p>Like some other metal difluorides, NiF2 crystallizes in the <a href="/facts/Rutile/qwJH5ElN">rutile</a> structure, which features octahedral Ni centers and planar fluorides.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
At low temperatures, its magnetic structure is antiferromagnetic.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
</p>
<h2 id="reactions">Reactions</h2>
<p>A melt of NiF2 and KF reacts to give successively potassium trifluoronickelate and <a href="/facts/Potassium_tetrafluoronickelate/ISlTuuIv">potassium tetrafluoronickelate</a>:<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a>
</p>
NiF2 + KF  →  K[NiF3]
K[NiF3] + KF  →  K2[NiF4]
<p>The structure of this material is closely related to some superconducting oxide materials.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a>
</p><p>Nickel(II) fluoride reacts with strong <a href="/facts/Base_(chemistry)/M9wA7qeM">bases</a> to give <a href="/facts/Nickel(II)_hydroxide/u4tthenl">nickel(II) hydroxide</a>:
</p>
NiF2 + 2 NaOH → Ni(OH)2 + 2 NaF

<h2 id="external-links">External links</h2>

Wikimedia Commons has media related to Nickel(II) fluoride.

<ul><li><a href="http://monographs.iarc.fr/ENG/Monographs/vol49/mono49-7.pdf">IARC Monograph "Nickel and Nickel compounds"</a></li>
<li><a href="https://web.archive.org/web/20060116134617/http://www.npi.gov.au/database/substance-info/profiles/44.html">National Pollutant Inventory - Fluoride compounds fact sheet</a></li>
<li><a href="https://web.archive.org/web/20060820043848/http://www.npi.gov.au/database/substance-info/profiles/62.html">National Pollutant Inventory - Nickel and compounds fact sheet</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Priest, H. F. (1950). "Anhydrous Metal Fluorides". Inorganic Syntheses. Vol. 3. pp. 171–183. doi:10.1002/9780470132340.ch47. ISBN 9780470132340. {{cite book}}: ISBN / Date incompatibility (help) <a href="9780470132340" target="_blank">9780470132340</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Stout, J. W.; Reed, Stanley A. (1954). "The Crystal Structure of MnF2, FeF2, CoF2, NiF2 and ZnF2". J. Am. Chem. Soc. 76 (21): 5279–5281. doi:10.1021/ja01650a005. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Strempfer, J; Ruett, U; Bayrakci, S.P.; Brueckel, Th.; Jauch, W (2004). "Magnetic properties of transition metal fluorides". Phys. Rev. B. 69: 014417. doi:10.1103/PhysRevB.69.014417. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Plevey, R. G.; Rendell, R. W.; Steward, M. P. (1974-01-01). "Fluorination with complex metal fluorides Part III. The fluorination of benzene over potassium hexafluoronickelate(IV)". Journal of Fluorine Chemistry. 3 (3–4): 267–273. Bibcode:1974JFluC...3..267P. doi:10.1016/S0022-1139(00)82626-3. ISSN 0022-1139. <a href="https://www.sciencedirect.com/science/article/pii/S0022113900826263" target="_blank">https://www.sciencedirect.com/science/article/pii/S0022113900826263</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>Balz, D. (1953). "Über die Struktur des K2NiF4". Naturwissenschaften. 40 (8): 241. Bibcode:1953NW.....40..241B. doi:10.1007/BF00591545. S2CID 32692990. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
</ol>

Nickel(II) fluoride open-in-new

Nickel(II) fluoride