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Latest revision as of 19:36, 27 October 2022 edit undoCitation bot (talk | contribs)Bots5,459,994 edits Misc citation tidying. | Use this bot. Report bugs. | Suggested by AManWithNoPlan | #UCB_CommandLine |
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{{chembox |
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| ImageFile = |
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| verifiedrevid = 455355332 |
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| ImageFile = Cobalt(II)-iodide-xtal-packing-3D-bs-17.png |
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| ImageSize = |
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| ImageSize = |
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| IUPACName = Cobalt(II) iodide |
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| IUPACName = Cobalt(II) iodide |
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| OtherNames = cobaltous iodide, cobalt diiodide |
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| OtherNames = cobaltous iodide, cobalt diiodide |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| Abbreviations = |
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| Abbreviations = |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = 15238-00-3 |
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| CASNo1_Ref = {{cascite|correct|CAS}} |
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| EINECS = |
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| CASNo1 = 15238-00-3 |
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| CASNo1_Comment = (HCl) |
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| CASNo2_Ref = {{cascite|changed|??}} |
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| CASNo2 = 52595-03-6 |
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| CASNo2_Comment = (hexahydrate) |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| UNII = RTJ1W9DF34 |
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| EINECS = 239-283-2 |
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| PubChem = 419951 |
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| PubChem = 419951 |
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| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}} |
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| SMILES = |
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| InChI = |
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| ChemSpiderID = 76542 |
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| SMILES = .. |
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| InChI = 1/Co.2HI/h;2*1H/q+2;;/p-2 |
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| InChIKey = AVWLPUQJODERGA-NUQVWONBAD |
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| StdInChI_Ref = {{stdinchicite|changed|chemspider}} |
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| StdInChI = 1S/Co.2HI/h;2*1H/q+2;;/p-2 |
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| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}} |
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| StdInChIKey = AVWLPUQJODERGA-UHFFFAOYSA-L |
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| MeSHName = |
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}} |
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|Section2={{Chembox Properties |
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| ATC_Supplemental =}} |
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| Section2 = {{Chembox Properties |
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| Formula = CoI<sub>2</sub> |
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| Formula = CoI<sub>2</sub> |
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| MolarMass = 312.7421 g/mol (anhydrous) <br> 420.83 g/mol (hexahydrate) |
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| MolarMass = 312.7421 g/mol (anhydrous) <br> 420.83 g/mol (hexahydrate) |
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| Appearance = α-form: black hexagonal crystal<br/>β-form: yellow powder |
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| Appearance = α-form: black hexagonal crystal<br/>β-form: yellow powder |
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| Density = α-form: 5.584 g/cm³<br/>β-form: 5.45 g/cm³ <br> hexahydrate: 2.09 g/cm<sup>3</sup> |
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| Density = α-form: 5.584 g/cm<sup>3</sup><br/>β-form: 5.45 g/cm<sup>3</sup> <br> hexahydrate: 2.79 g/cm<sup>3</sup> |
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| MeltingPt = α-form: 515-520°C under vacuum<br/>β-form: converts to α-form at 400°C |
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| MeltingPt = α-form: 515-520 °C under vacuum<br/>β-form: converts to α-form at 400 °C |
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| BoilingPt = 570 °C |
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| BoilingPtC = 570 |
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| Solubility = 67.0 g/100 mL<ref name="comp"> |
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| Solubility = 67.0 g/100 mL<ref name="comp"> |
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{{Citation |
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{{Citation |
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| last = Perry |
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| last1 = Perry |
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| first = Dale L. |
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| first1 = Dale L. |
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| author-link = |
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| author-link = |
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| last2 = Phillips |
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| last2 = Phillips |
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| first2 = Sidney L. |
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| first2 = Sidney L. |
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| author2-link = |
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| author2-link = |
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| publication-date = |
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| publication-date = |
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| date = |
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| year = 1995 |
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| title = Handbook of Inorganic Compounds |
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| year = 1995 |
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| edition = |
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| title = Handbook of Inorganic Compounds |
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| edition = |
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| volume = |
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| series = |
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| location = San Diego |
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| series = |
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| publication-place = San Diego |
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| place = |
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| place = |
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| publisher = CRC Press |
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| id = |
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| publisher = CRC Press |
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| isbn = 0-8493-8671-3 |
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| id = |
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| doi = |
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| isbn = 0849386713 |
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| doi = |
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| oclc = |
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| pages = 127–8 |
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| url = https://books.google.com/books?id=0fT4wfhF1AsC&q=%22Cobalt(II)+iodide%22&pg=PA128 |
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| pages = 127–8 |
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| access-date = 2008-06-03 |
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| url = http://books.google.com/?id=0fT4wfhF1AsC&pg=PA128&dq=%22Cobalt(II)+iodide%22 |
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| accessdate = 2008-06-03 |
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}}</ref> |
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}}</ref> |
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| SolubleOther = |
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| SolubleOther = |
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| Solvent = |
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| Solvent = |
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| pKa = |
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| pKa = |
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| pKb = }} |
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| MagSus = +10,760·10<sup>−6</sup> cm<sup>3</sup>/mol}} |
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| Section7 = {{Chembox Hazards |
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|Section7={{Chembox Hazards |
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| ExternalMSDS = |
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| ExternalSDS = |
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| EUClass = Harmful ('''Xn''') |
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| GHSPictograms = {{GHS07}}{{GHS08}} |
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| EUIndex = |
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| GHSSignalWord = Warning |
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| HPhrases = {{H-phrases|302|312|315|319|332|335}} |
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| PPhrases = {{P-phrases|}} |
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| MainHazards = |
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| MainHazards = |
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| NFPA-H = 3 |
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| NFPA-H = 3 |
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| NFPA-F = 0 |
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| NFPA-F = 0 |
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| NFPA-R = 1 |
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| NFPA-R = 1 |
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| NFPA-O = |
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| NFPA-S = |
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| RPhrases = {{R20/21/22}}, {{R36/37/38}} |
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| SPhrases = {{S26}}, {{S36}}<ref name="sa"> |
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{{cite web |url= https://www.sigmaaldrich.com/ProductLookup.html?ProdNo=429740&Brand=ALDRICH|title= 429740 Cobalt(II) iodide anhydrous, beads, −10 mesh, 99.999% |accessdate=2008-06-03 |publisher= Sigma-Aldrich|date= }}</ref> |
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| FlashPt = |
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| Autoignition = |
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| AutoignitionPt = |
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| ExploLimits = |
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| PEL = }} |
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| Section8 = {{Chembox Related |
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|Section8={{Chembox Related |
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| OtherAnions = ]<br />]<br />] |
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| OtherAnions = ]<br />]<br />] |
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| OtherCations = ]<br />] |
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| OtherCations = ]<br />] |
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}} |
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}} |
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'''Cobalt(II) iodide''' or '''cobaltous iodide''' is the ] composed with the ] ] ]<sub>2</sub>. The two forms of CoI<sub>2</sub> and the hydrated form are the principal iodides of cobalt. |
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'''Cobalt(II) iodide''' or '''cobaltous iodide''' are the ]s with the ] ]]<sub>2</sub> and the ] CoI<sub>2</sub>(H<sub>2</sub>O)<sub>6</sub>. These salts are the principal iodides of cobalt.<ref name=Brauer/> |
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==Synthesis and structure== |
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==Synthesis== |
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Cobalt(II) iodide is prepared by treating cobalt powder with ]eous ].<ref name=Brauer/> The hydrated form (CoI<sub>2</sub>(H<sub>2</sub>O)<sub>6</sub>) can be prepared by the reaction of ] (or relate cobalt compounds) with ]. |
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Cobalt(II) iodide is prepared by treating cobalt powder with ]eous ].<ref name=Brauer/> The hydrated form CoI<sub>2</sub>.6H<sub>2</sub>O can be prepared by the reaction of ] (or related cobalt compounds) with ]. |
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Cobalt(II) iodide crystallizes in two ]s, the α- and β-forms. The α-polymorph consists of black hexagonal crystals which turn dark green when exposed to air. Heating samples of α-CoI<sub>2</sub> under a vacuum at 500 C causes sublimation, yielding the β-polymorph is a yellow crystals. β-CoI<sub>2</sub> also readily absorbs moisture from the air, converting into green droplets. Upon heating to 400°C, β-CoI<sub>2</sub> converts to the α-form.<ref name=Brauer>Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1518.</ref> |
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Cobalt(II) iodide crystallizes in two ]s, the α- and β-forms. The α-polymorph consists of black hexagonal crystals, which turn dark green when exposed to air. Under a vacuum at 500 °C, samples of α-CoI<sub>2</sub> sublime, yielding the β-polymorph as a yellow crystals. β-CoI<sub>2</sub> also readily absorbs moisture from the air, converting into green hydrate. At 400 °C, β-CoI<sub>2</sub> reverts to the α-form.<ref name=Brauer>O. Glemser "Cobalt, Nickel" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1518.</ref> |
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==Structures== |
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The anhydrous salts adopt the cadmium halide structures. |
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The hexaaquo salt consists of separated <sup>2+</sup> and iodide ions as verified crystallographically.<ref name=Lou>“Structure Cristalline et Expansion Thermique de L’Iodure de Nickel Hexahydrate“ (Crystal structure and thermal expansion of nickel(II) iodide hexahydrate) Louër, Michele; Grandjean, Daniel; Weigel, Dominique Journal of Solid State Chemistry (1973), 7(2), 222-8. {{doi| 10.1016/0022-4596(73)90157-6}}</ref><ref>"The crystal structure of the crystalline hydrates of transition metal salts. The structure of CoI<sub>2</sub>·6H<sub>2</sub>O" Shchukarev, S. A.; Stroganov, E. V.; Andreev, S. N.; Purvinskii, O. F. Zhurnal Strukturnoi Khimii 1963, vol. 4, pp. 63-6.<!no doi in CAS--></ref> |
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==Reactions and applications== |
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==Reactions and applications== |
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Anhydrous cobalt(II) iodide is sometimes used to test for the presence of water in various solvents.<ref name="pur"> |
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Anhydrous cobalt(II) iodide is sometimes used to test for the presence of water in various solvents.<ref name="pur"> |
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{{Citation |
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{{Citation |
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| last = Armarego |
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| last1 = Armarego |
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| first = Wilfred L. F. |
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| first1 = Wilfred L. F. |
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| author-link = |
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| author-link = |
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| last2 = Chai |
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| last2 = Chai |
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| first2 = Christina L. L. |
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| first2 = Christina L. L. |
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| author2-link = |
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| author2-link = |
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| publication-date = |
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| publication-date = |
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| date = |
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| year = 2003 |
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| title = Purification of Laboratory Chemicals |
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| year = 2003 |
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| edition = |
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| title = Purification of Laboratory Chemicals |
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| publisher = Butterworth-Heinemann |
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| publisher = Butterworth-Heinemann |
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| isbn = 0-7506-7571-3 |
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| doi = |
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| isbn = 0750675713 |
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| pages = 26 |
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| url = https://books.google.com/books?id=SYzm1tx2z3QC&q=%22Cobalt(II)+iodide%22&pg=PA26 |
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| pages = 26 |
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| access-date = 2008-06-03 |
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| url = http://books.google.com/?id=SYzm1tx2z3QC&pg=PA26&dq=%22Cobalt(II)+iodide%22 |
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| accessdate = 2008-06-03 |
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}}</ref> |
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}}</ref> |
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Cobalt(II) iodide is used as a catalyst, e.g. in ]s. It catalyzes the reaction of ] with ], useful for the synthesis of ]<ref name="poison"> |
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Cobalt(II) iodide is used as a catalyst, e.g. in ]s. It catalyzes the reaction of ] with ], useful for the synthesis of ]<ref name="poison"> |
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{{Citation |
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{{Citation |
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| last = Agreda |
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| last1 = Agreda |
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| first = V. H. |
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| first1 = V. H. |
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| author-link = |
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| author-link = |
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| last2 = Zoeller |
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| last2 = Zoeller |
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| first2 = Joseph R. |
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| first2 = Joseph R. |
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| author2-link = |
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| author2-link = |
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| publication-date = |
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| publication-date = |
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| date = |
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| year = 1992 |
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| title = Acetic Acid and Its Derivatives |
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| year = 1992 |
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| edition = |
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| title = Acetic Acid and Its Derivatives |
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| publisher = CRC Press |
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| publisher = CRC Press |
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| isbn = 0-8247-8792-7 |
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| isbn = 0824787927 |
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| pages = 74 |
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| url = https://books.google.com/books?id=3MjdGp1v1YIC&q=%22Cobalt(II)+iodide%22&pg=RA1-PA784 |
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| pages = 74 |
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| access-date = 2008-06-03 |
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| url = http://books.google.com/?id=3MjdGp1v1YIC&pg=RA1-PA784&dq=%22Cobalt(II)+iodide%22 |
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| accessdate = 2008-06-03 |
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}}</ref> |
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{{Cobalt compounds}} |
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{{Cobalt compounds}} |
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{{Iodides}} |
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{{DEFAULTSORT:Cobalt(Ii) Iodide}} |
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{{DEFAULTSORT:Cobalt(Ii) Iodide}} |
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