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{{chembox
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| Verifiedfields = changed
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| verifiedrevid = 431907741
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| verifiedrevid = 455176441
| Name = Potassium cobaltinitrite
| Name = Potassium cobaltinitrite
| ImageFile = Potassium cobaltinitrite.svg
| ImageFile = Potassium cobaltinitrite.svg
| ImageSize = 200px
| ImageSize = 200px
| ImageName =
| ImageName =
| ImageFile1 = Cobalt yellow.jpg
| ImageFile1 = Cobalt yellow.jpg
| IUPACName = Potassium hexanitritocobaltate(III)
| IUPACName = Potassium hexanitritocobaltate(III)
| OtherNames =
| OtherNames = Potassium cobaltinitrite
|Section1={{Chembox Identifiers
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo= 13782-01-9
| CASNo= 13782-01-9
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| PubChem=
| UNII_Ref = {{fdacite|correct|FDA}}
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| SMILES=N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].[K+].[K+].[K+].[Co]
| UNII = 40W79B48SV
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| PubChem= 25022080
| InChI = 1S/Co.3K.6HNO2.H2O/c;;;;6*2-1-3;/h;;;;6*(H,2,3);1H2/q+3;3*+1;;;;;;;/p-6
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| SMILES=N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].[K+].[K+].[K+].[Co]
}}
}}
|Section2={{Chembox Properties
|Section2={{Chembox Properties
| Formula = K<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>] (anhydrous)<br/> K<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>]·1.5H<sub>2</sub>O (sesquihydrate)
| Formula = K<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>] (anhydrous)<br/> K<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>]·1.5H<sub>2</sub>O (sesquihydrate)
| MolarMass = 452.26 g/mol (anhydrous)<br/>479.284 g/mol (sesquihydrate)
| MolarMass = 452.26 g/mol (anhydrous)<br/>479.284 g/mol (sesquihydrate)
| Appearance=yellow [[Cubic crystal system|cubic]] crystals (sesquihydrate)
| Appearance=yellow [[Cubic crystal system|cubic]] crystals (sesquihydrate)
| Density=2.6 g/cm<sup>3</sup> (sesquihydrate)
| Density=2.6 g/cm<sup>3</sup> (sesquihydrate)
| MeltingPt=
| MeltingPt=
| BoilingPt=
| BoilingPt=
| Solubility=slightly soluble in water (sesquihydrate)
| Solubility=slightly soluble in water (sesquihydrate)
|SolubleOther = reacts with [[acid]]s, insoluble in [[ethanol]] (sesquihydrate)<ref name="hand">
| SolubleOther = reacts with [[acid]]s, insoluble in [[ethanol]] (sesquihydrate)<ref name="hand">
{{Cite book
{{Cite book
| last = Lide
| last = Lide
| first = David R.
| first = David R.
| author-link =
| author-link =
| last2 =
| first2 =
| author2-link =
| publication-date =
| date =
| year = 1998
| year = 1998
| title = Handbook of Chemistry and Physics
| title = Handbook of Chemistry and Physics
| edition = 87
| edition = 87
| volume =
| volume =
| series =
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| publication-place = Boca Raton, FL
| location = Boca Raton, Florida
| place =
| publisher = CRC Press
| publisher = CRC Press
| id =
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| pages = 4–54
| pages = 4–54
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|Section3={{Chembox Hazards
|Section3={{Chembox Hazards
| ExternalMSDS =
| ExternalSDS =
| FlashPt=
| FlashPt=
| AutoignitionPt =
| Autoignition=
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'''Potassium cobaltinitrite''', [[IUPAC nomenclature|IUPAC name]] '''potassium hexanitritocobaltate(III)''', is a [[coordination compound]] with the formula K<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>]. The anion of this yellow-coloured salt consists of a cobalt(III) center bound to six nitrito ligands. It is insoluble in water and is precipitated as yellow solids.
'''Potassium hexanitritocobaltate(III)''' is a salt with the formula K<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>]. It is a yellow solid that is poorly soluble in water. The compound finds some use as a yellow pigment under the name '''Indian Yellow'''.


The salt features potassium cations and an trianionic [[coordination complex]]. In the anion, cobalt is bound by six nitrito ligands, the overall complex having [[octahedral molecular geometry]]. The oxidation state of cobalt is 3+. Its low-spin d<sup>6</sup> configuration confers kinetic stability and diamagnetism. The compound is prepared by combining cobalt(II) and nitrite salts in the presence of oxygen. The corresponding sodium cobaltinitrite is significantly more soluble in water.<ref>{{cite book|author=O. Glemser|chapter=Sodium Hexanitritocobaltate (III)|title=Handbook of Preparative Inorganic Chemistry, 2nd Ed. |editor=G. Brauer|publisher=Academic Press|year=1963|place=NY, NY|volume=1|pages=1541}}</ref>
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It was first made in 1848 by N. W. Fischer in [[Breslau]]<ref>{{cite journal | doi = 10.1002/andp.18491500512 | title = Ueber die salpetrichtsauren Salze | year = 1848 | last1 = Fischer | first1 = N. W. | journal = Annalen der Physik und Chemie | volume = 150 | issue = 5 | pages = 115–125}}</ref> and it is used as a yellow pigment called [[Aureolin]].<ref name="Gates">{{cite journal | jstor = 1506479 | pages = 201–206 | last1 = Gates | first1 = G. | title = A Note on the Artists' Pigment Aureolin | volume = 40 | issue = 3 | journal = Studies in Conservation | year = 1995 | doi = 10.2307/1506479}}</ref><ref name="Getts">{{cite book | url = http://books.google.de/books?id=bdQVgKWl3f4C&pg=PA109 | title = Painting materials: A short encyclopaedia | isbn = 9780486215976 | author1 = Gettens, Rutherford John | author2 = Stout, George Leslie | year = 1966 | pages =109–110}}</ref>

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The compound was first described in 1848 by [[Nikolaus Wolfgang Fischer]] in [[Breslau]],<ref>{{cite journal | doi = 10.1002/andp.18491500512 | title = Ueber die salpetrichtsauren Salze | year = 1848 | last1 = Fischer | first1 = N. W. | journal = Annalen der Physik und Chemie | volume = 150 | issue = 5 | pages = 115–125|bibcode = 1848AnP...150..115F | url = https://zenodo.org/record/1423620 }}</ref> and it is used as a yellow pigment called [[Aureolin]].<ref name="Gates">{{cite journal | jstor = 1506479 | pages = 201–206 | last1 = Gates | first1 = G. | title = A Note on the Artists' Pigment Aureolin | volume = 40 | issue = 3 | journal = Studies in Conservation | year = 1995 | doi = 10.2307/1506479}}</ref><ref name="Getts">{{cite book | url = https://books.google.com/books?id=bdQVgKWl3f4C&pg=PA109 | title = Painting materials: A short encyclopaedia | isbn = 978-0-486-21597-6 | author1 = Gettens, Rutherford John | author2 = Stout, George Leslie | year = 1966 | pages =109–110| publisher = Courier Corporation }}</ref>


==See also==
==See also==
*[[Sodium cobaltinitrite]]
*[[Sodium hexanitritocobaltate(III)]]


==References==
==References==
{{reflist}}
{{reflist}}
{{potassium compounds}}
{{cobalt compounds}}


[[Category:Potassium compounds]]
[[Category:Potassium compounds]]
[[Category:Cobalt compounds]]
[[Category:Cobalt(III) compounds]]
[[Category:Nitrites]]
[[Category:Nitrites]]
[[Category:Coordination compounds]]
[[Category:Cobalt complexes]]



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