Nickel dicyanide
{{Short description|Chemical compound}}
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| ImageFile = Nickel(II)-cyanid.jpg
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| Section1 = {{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| index2_label=tetrahydrate
| ChemSpiderID = 10711
| PubChem = 11184
| PubChem2 = 71317429
| CASNo = 557-19-7
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo2 = 13477-95-7
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| EC_number = 209-160-8
| UNNumber = 1653
| UNII = YX45CR8P6A
| StdInChI=1S/2CN.Ni/c2*1-2;/q2*-1;+2
| StdInChIKey = NLEUXPOVZGDKJI-UHFFFAOYSA-N
| SMILES = [C-]#N.[C-]#N.[Ni+2]
| SMILES2 = [C-]#N.[C-]#N.O.O.O.O.[Ni+2]
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| Section2 = {{Chembox Properties
| Formula = Ni(CN)2
| MolarMass = 110.729
| Appearance = yellow-brown solid (dry)
blue gray solid (tetrahydrate)《无机化学丛书》.第九卷 锰分族 铁系 铂系. 科学出版社. P286 – "Inorganic Chemistry Series". Volume 9 Manganese Subgroups, Iron Series, Platinum Series. Science Press. P286. Nickel Cyanide (II). 氰化镍(II) – Nickel cyanide(II).
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| GHSPictograms = {{GHS07}}{{GHS08}}{{GHS09}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|317|334|350|372|410}}
| PPhrases = {{P-phrases|201|202|260|261|264|270|272|273|280|281|285|302+352|304+341|308+313|314|321|333+313|342+311|363|391|405|501}}
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| Section8 = {{Chembox Related
| OtherCations = Iron(II) cyanide
Cobalt(II) cyanide
| OtherCompounds = Potassium cyanonickelate
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Nickel dicyanide is the inorganic compound with a chemical formula Ni(CN)2. It is a gray-green solid that is insoluble in most solvents.{{Ullmann |doi=10.1002/14356007.a08_159.pub2|chapter=Cyano Compounds, Inorganic|year=2004|last1=Gail|first1=Ernst|last2=Gos|first2=Stephen|last3=Kulzer|first3=Rupprecht|last4=Lorösch|first4=Jürgen|last5=Rubo|first5=Andreas|last6=Sauer|first6=Manfred|isbn=3527306730}}
Production
Addition of two equivalents of sodium or potassium cyanide to a solution of nickel(II) ions in aqueous solution leads to the precipitation of nickel(II) cyanide tetrahydrate.{{cite book |doi=10.1002/9780470132333.ch73|chapter=Potassium Tetracyanonickelate(II)|year=1946|last1=Fernelius|first1=W. C.|last2=Burbage|first2=Joseph J.|title=Inorganic Syntheses|pages=227–228|volume=2|isbn=9780470132333}} On heating the tetrahydrate to 140 °C, this hydrate converts to anhydrous nickel(II) cyanide.
Chemical properties
File:Potassium tetracyanonickelate solution.jpg) solution)]]
Nickel(II) cyanide dissolves in potassium cyanide solution to produce a yellowish solution containing potassium tetracyanonickelate:
: Ni(CN)2 + 2 KCN → K2[Ni(CN)4]
Nickel(II) cyanide will react with dimethylglyoxime (dmgH2) and produce hydrogen cyanide:《无机化学反应方程式手册》.曹忠良 王珍云 编.湖南科学技术出版社.第十三章 铁系元素. – "Handbook of Inorganic Chemical Reaction Equations". Cao Zhongliang, Wang Zhenyun, ed. Hunan Science and Technology Press. Chapter 13: Iron Series Elements. P379. 【其他含镍的化合物】– 【Other nickel-containing compounds】.
: Ni(CN)2 + 2{{nbsp}}dmgH2 → Ni(dmgH)2 + 2{{nbsp}}HCN