Zinc cyanide 5066497 223339003 2008-07-03T17:18:47Z SpellingBot 6773085 discribed → described {{Chembox new | Name = Zinc cyanide | ImageFile = zinc_cyanide.jpg <!-- | ImageSize = 200px --> | ImageName = Zinc cyanide | OtherNames = potassium sulfocyanate<br />potassium isothiocyanate<br />potassium thiocyanide | Section1 = {{Chembox Identifiers | CASNo = 557-21-1 }} | Section2 = {{Chembox Properties | Formula = Zn(CN)<sub>2</sub> | MolarMass = 117.41 g/mol | Appearance = off-white powder | Density = 1.852 g/cm<sup>3</sup>, solid | Solubility = insoluble | MeltingPt = 800 °C (decomposes) | BoilingPt = }} | Section7 = {{Chembox Hazards | EUClass = not listed | NFPA-H = 4 | NFPA-R = 2 | NFPA-F = 0 }} }} '''Zinc cyanide''' is the [[inorganic]] [[chemical compound]] with the formula [[Zinc|Zn]]([[Carbon|C]][[Nitrogen|N]])<sub>2</sub>. It adopts a polymeric structure consisting of tetrahedral zinc centers linked by bridging [[cyanide]] [[ligand]]s. The structure can also be described as being two interpenertrating adamantain structures. The cyanide group shows head to tail disorder with any zinc atom having between 1 and 4 carbon niegbours and the remaining being nitrogen atoms. It shows one of the largest negative coefficents of thermal expantion, beating the previous largest zerconium tungstate. Zn(CN)<sub>2</sub> is employed as a catalyst for the cyanosilylation of aldehydes and ketones.<ref>{{cite journal | author = Rasmussen J. K., Heilmann S. M. | title = In situ Cyanosilylation of Carbonyl Compounds: O-Trimethylsilyl-4-Methoxymandelonitrile | journal = Organic Syntheses, Collected Volume | volume = 7 | pages = 521 | year = 1990 | url= http://www.orgsyn.org/orgsyn/prep.asp?prep=cv7p0521}} </ref> It is also used to introduce the [[formyl]] group in [[organic synthesis]]. 2-Hydroxy-1-naphthaldehyde has been prepared from 2-naphthol, zinc cyanide, and anhydrous hydrogen chloride.<ref> {{cite journal | author = [[Roger Adams|Adams R.]], Levine I. | title = Simplification of the Gattermann Synthesis of Hydroxy Aldehydes | journal = [[Journal of the American Chemical Society]] | year = 1923 | volume = 45 | pages = 2373–77 | doi = 10.1021/ja01663a020}} </ref><ref> {{cite journal | author =Fuson R. C., Horning E. C., Rowland S. P., Ward M. L. | title = Mesitaldehyde | journal = Organic Syntheses, Collected Volume | volume = 3 | pages = 549 | year = 1955 | url=http://www.orgsyn.org/orgsyn/prep.asp?prep=cv3p0549}} </ref> Zinc cyanide is also a byproduct of gold extraction were zinc metal is added to the gold cyanide solution to precipitate the gold. ==References== <div class="references-small"><references /></div> [[Category:Cyanides]] [[Category:Zinc compounds]] [[Category:Inorganic compound stubs]] {{inorganic-compound-stub}} [[ar:سيانيد خارصين]]