Cobalt sulfide: Difference between revisions

Cobalt sulfide
Identifiers
CAS Number	CoS: 1317-42-6 ;
3D model (JSmol)	CoS: Interactive image;
ChemSpider	CoS: 140220;
EC Number	CoS: 215-273-3;
PubChem CID	CoS: 14832;
RTECS number	CoS: GG332500;
UNII	CoS: INZ5E36Y1V ;
	InChI InChI=1S/Co.S Key: VRRFSFYSLSPWQY-UHFFFAOYSA-N;
	SMILES CoS: S=[Co];
Properties
Chemical formula	CoxSy
Molar mass	90.9982 g/mol
Appearance	black solid (alpha) ; grayish-red crystals (beta)
Density	5.45 g/cm3
Melting point	1195 °C
Solubility in water	0.00038 g/100 mL (18 °C)
Solubility	slightly soluble in acid
Magnetic susceptibility (χ)	+225.0·10−6 cm3/mol
Structure
Crystal structure	octahedral (beta)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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Cobalt sulfide is the name for chemical compounds with a formula Co_xS_y. Well-characterized species include minerals with the formulas CoS, CoS₂, Co₃S₄, and Co₉S₈. In general, the sulfides of cobalt are black, semiconducting, insoluble in water, and nonstoichiometric.^[1]

Minerals and hydrometallurgy

Cobalt sulfides occur widely as minerals, comprising major sources of all cobalt compounds. Binary cobalt sulfide minerals include the cattierite (CoS₂) and linnaeite (Co₃S₄). CoS₂ (see image in table) is isostructural with iron pyrite, featuring disulfide groups, i.e. Co²⁺S₂²⁻. Linnaeite, also rare, adopts the spinel motif.^[2] The Co₉S₈ compound is known as a very rare cobaltpentlandite (the Co analogue of pentlandite).^[3] Mixed metal sulfide minerals include carrollite (CuCo₂S₄) and siegenite (Co_3−xNi_xS₄).

CoS is known as jaipurite. However, this species is questionable.^[4]^[5]

Cobalt sulfide minerals are converted to cobalt via roasting and extraction into aqueous acid. In some processes, cobalt salts are purified by precipitation when aqueous solutions of cobalt(II) ions are treated with hydrogen sulfide. Not only is this reaction useful in the purification of cobalt from its ores, but also in qualitative inorganic analysis.^[1]

Applications and research

In combination with molybdenum, the sulfides of cobalt are used as catalysts for the industrial process called hydrodesulfurization, which is implemented on a large scale in refineries. Synthetic cobalt sulfides are widely investigated as electrocatalysts.^[6]

Selected literature

Congiu, M.; Albano, L. G. S.; Decker, F.; Graeff, C. F. O. (2015-01-01). "Single precursor route to efficient cobalt sulphide counter electrodes for Dye-sensitized solar cells". Electrochimica Acta. 151: 517–524. doi:10.1016/j.electacta.2014.11.001.
Huo, Jinghao; Zheng, Min; Tu, Yongguang; Wu, Jihuai; Hu, Linhua; Dai, Songyuan (2015-03-20). "A high performance cobalt sulfide counter electrode for dye-sensitized solar cells". Electrochimica Acta. 159: 166–173. doi:10.1016/j.electacta.2015.01.214.
Congiu, M.; Albano, L. G. S.; Decker, F.; Graeff, C. F. O. (2015-01-01). "Single precursor route to efficient cobalt sulphide counter electrodes for dye sensitized solar cells". Electrochimica Acta. 151: 517–524. doi:10.1016/j.electacta.2014.11.001.
Congiu, Mirko; Lanuti, Alessandro; di Carlo, Aldo; Graeff, Carlos F. O. (2015-12-01). "A novel and large area suitable water-based ink for the deposition of cobalt sulfide films for solar energy conversion with iodine-free electrolytes". Solar Energy. 122: 87–96. Bibcode:2015SoEn..122...87C. doi:10.1016/j.solener.2015.08.032. hdl:11449/177482.
Lin, Jeng-Yu; Liao, Jen-Hung; Wei, Tzu-Chien (2011-04-01). "Honeycomb-like CoS Counter Electrodes for Transparent Dye-Sensitized Solar Cells". Electrochemical and Solid-State Letters. 14 (4): D41 – D44. doi:10.1149/1.3533917. ISSN 1099-0062.
Lin, Jeng-Yu; Liao, Jen-Hung; Chou, Shu-Wei (2011-10-01). "Cathodic electrodeposition of highly porous cobalt sulfide counter electrodes for dye-sensitized solar cells". Electrochimica Acta. 56 (24): 8818–8826. doi:10.1016/j.electacta.2011.07.080.
Congiu, Mirko; Bonomo, Matteo; Marco, Maria Letizia De; Dowling, Denis P.; Di Carlo, Aldo; Dini, Danilo; Graeff, Carlos F. O. (2016-07-16). "Cobalt Sulfide as Counter Electrode in p-Type Dye-Sensitized Solar Cells". ChemistrySelect. 1 (11): 2808–2815. doi:10.1002/slct.201600297. ISSN 2365-6549.
Nattestad, Andrew; Ferguson, Michael; Kerr, Robert; Cheng, Yi-Bing; Bach, Udo (2008). "Dye-sensitized nickel(II)oxide photocathodes for tandem solar cell applications". Nanotechnology. 19 (29): 295304. Bibcode:2008Nanot..19C5304N. doi:10.1088/0957-4484/19/29/295304. PMID 21730603. S2CID 30601690. ^{[permanent dead link‍]}

References

^ ^a ^b John D. Donaldson, Detmar Beyersmann "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a07_281.pub2
^ Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. ISBN 978-0-08-022057-4.
^ "Home". mindat.org.
^ "Jaipurite".
^ "List of Minerals". 21 March 2011.
^ Mathew, Simon; Yella, Aswani; Gao, Peng; Humphry-Baker, Robin; Curchod, Basile F. E.; Ashari-Astani, Negar; Tavernelli, Ivano; Rothlisberger, Ursula; Nazeeruddin, Md. Khaja (2014). "Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers". Nature Chemistry. 6 (3): 242–247. Bibcode:2014NatCh...6..242M. doi:10.1038/nchem.1861. PMID 24557140.

Cobalt sulfide, NIST Webbook

This material-related article is a stub. You can help Wikipedia by expanding it.

[Ullmann-1] John D. Donaldson, Detmar Beyersmann "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a07_281.pub2

[2] Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. ISBN 978-0-08-022057-4.

[3] "Home". mindat.org.

[4] "Jaipurite".

[5] "List of Minerals". 21 March 2011.

[6] Mathew, Simon; Yella, Aswani; Gao, Peng; Humphry-Baker, Robin; Curchod, Basile F. E.; Ashari-Astani, Negar; Tavernelli, Ivano; Rothlisberger, Ursula; Nazeeruddin, Md. Khaja (2014). "Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers". Nature Chemistry. 6 (3): 242–247. Bibcode:2014NatCh...6..242M. doi:10.1038/nchem.1861. PMID 24557140.

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@@ Line 9: / Line 9: @@
 | OtherNames =
 |Section1={{Chembox Identifiers
+| index_label=CoS
 | CASNo_Ref = {{cascite|correct|??}}
 | CASNo = 1317-42-6
+| ChemSpiderID = 140220
+| EC_number = 215-273-3
+| UNII_Ref = {{fdacite|correct|FDA}}
+| UNII = INZ5E36Y1V
 | PubChem = 14832
 | RTECS = GG332500
+| StdInChI=1S/Co.S
-| SMILES = }}
+| StdInChIKey = VRRFSFYSLSPWQY-UHFFFAOYSA-N
+| SMILES = S=[Co]
+ }}
 |Section2={{Chembox Properties
-| Formula = CoS (varied)
+| Formula = Co<sub>x</sub>S<sub>y</sub>
 | MolarMass = 90.9982 g/mol
-| Appearance = black solid (alpha) <br> grayish-red crystals (beta)
+| Appearance = black solid (alpha) <br /> grayish-red crystals (beta)
 | Density = 5.45 g/cm<sup>3</sup>
 | MeltingPt = 1195 °C
@@ Line 34: / Line 42: @@
 }}
-'''Cobalt sulfide''' is the name for [[chemical compound]]s with a formula Co<sub>x</sub>S<sub>y</sub>.  Well-characterized species include minerals with the formula CoS, CoS<sub>2</sub>, Co<sub>3</sub>S<sub>4</sub>, and Co<sub>9</sub>S<sub>8</sub>. In general, the sulfides of cobalt are black, [[semi-conductor|semiconducting]], insoluble in water, and [[Non-stoichiometric compound|nonstoichiometric]].<ref name=Ullmann>John D. Donaldson, Detmar Beyersmann "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim.  {{DOI|10.1002/14356007.a07_281.pub2}}</ref>
+'''Cobalt sulfide''' is the name for [[chemical compound]]s with a formula Co<sub>x</sub>S<sub>y</sub>.  Well-characterized species include minerals with the formulas CoS, CoS<sub>2</sub>, Co<sub>3</sub>S<sub>4</sub>, and Co<sub>9</sub>S<sub>8</sub>. In general, the sulfides of cobalt are black, [[semi-conductor|semiconducting]], insoluble in water, and [[Non-stoichiometric compound|nonstoichiometric]].<ref name=Ullmann>John D. Donaldson, Detmar Beyersmann "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim.  {{doi|10.1002/14356007.a07_281.pub2}}</ref>
 ==Minerals and hydrometallurgy==
-Cobalt sulfides occur widely as minerals, comprising major sources of all cobalt compounds.  Binary cobalt sulfide minerals include the [[cattierite]] (CoS<sub>2</sub>) and [[linnaeite]] (Co<sub>3</sub>S<sub>4</sub>).  CoS<sub>2</sub> (see image in table) is isostructural with iron [[pyrite]], featuring disulfide groups, i.e. Co<sup>2+</sup>S<sub>2</sub><sup>2−</sup>.  Linnaeite, also rare, adopts the [[spinel]] motif.<ref>{{cite book |title=Chemistry of the Elements |last=Greenwood |first=Norman N. |authorlink= |author2=Earnshaw, Alan |year=1984 |publisher=Pergamon Press |location=Oxford |isbn=0-08-022057-6 |pages= }}</ref> The Co<sub>9</sub>S<sub>8</sub> compound is known as a very rare cobaltpentlandite (the Co analogue of [[pentlandite]]).<ref>http://www.mindat.org</ref>  Mixed metal sulfide minerals include [[carrollite]] (CuCo<sub>2</sub>S<sub>4</sub>) and [[siegenite (Co<sub>3−x</sub>Ni<sub>x</sub>S<sub>4</sub>).
+Cobalt sulfides occur widely as minerals, comprising major sources of all cobalt compounds.  Binary cobalt sulfide minerals include the [[cattierite]] (CoS<sub>2</sub>) and [[linnaeite]] (Co<sub>3</sub>S<sub>4</sub>).  CoS<sub>2</sub> (see image in table) is isostructural with iron [[pyrite]], featuring disulfide groups, i.e. Co<sup>2+</sup>S<sub>2</sub><sup>2−</sup>.  Linnaeite, also rare, adopts the [[spinel]] motif.<ref>{{cite book |title=Chemistry of the Elements |last=Greenwood |first=Norman N. |author2=Earnshaw, Alan |year=1984 |publisher=Pergamon Press |location=Oxford |isbn=978-0-08-022057-4 }}</ref> The Co<sub>9</sub>S<sub>8</sub> compound is known as a very rare cobaltpentlandite (the Co analogue of [[pentlandite]]).<ref>{{cite web |url=http://www.mindat.org/ |title=Home |website=mindat.org}}</ref>  Mixed metal sulfide minerals include [[carrollite]] (CuCo<sub>2</sub>S<sub>4</sub>) and [[siegenite]] (Co<sub>3−x</sub>Ni<sub>x</sub>S<sub>4</sub>).
+CoS is known as jaipurite. However, this species is questionable.<ref>{{Cite web | url=https://www.mindat.org/min-7119.html | title=Jaipurite }}</ref><ref>{{Cite web | url=https://www.ima-mineralogy.org/Minlist.htm | title=List of Minerals | date=21 March 2011 }}</ref>
-Cobalt sulfide minerals are converted to cobalt via roasting and extraction into aqueous acid.  In some processes, the cobalt salts are further purified by precipitated when aqueous solutions of cobalt(II) ions are treated with [[hydrogen sulfide]].  Not only is this reaction useful in the purification of cobalt from its ores, but also in [[qualitative inorganic analysis]].<ref name=Ullmann/>
+Cobalt sulfide minerals are converted to cobalt via roasting and extraction into aqueous acid.  In some processes, cobalt salts are  purified by precipitation when aqueous solutions of cobalt(II) ions are treated with [[hydrogen sulfide]].  Not only is this reaction useful in the purification of cobalt from its ores, but also in [[qualitative inorganic analysis]].<ref name=Ullmann/>
 ==Applications and research==
-In combination with molybdenum, the sulfides of cobalt are used as catalysts for the industrial process called [[hydrodesulfurization]], which is implemented on a large scale in [[refinery|refineries]].  Synthetic cobalt sulfides are widely investigated as electrocatalysts.<ref>{{Cite journal|last=Mathew|first=Simon|last2=Yella|first2=Aswani|last3=Gao|first3=Peng|last4=Humphry-Baker|first4=Robin|last5=Curchod|first5=Basile F. E.|last6=Ashari-Astani|first6=Negar|last7=Tavernelli|first7=Ivano|last8=Rothlisberger|first8=Ursula|last9=Nazeeruddin|first9=Md. Khaja|title=Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers|url=http://www.nature.com/doifinder/10.1038/nchem.1861|journal=Nature Chemistry|volume=6|issue=3|pages=242–247|doi=10.1038/nchem.1861}}</ref>
+In combination with molybdenum, the sulfides of cobalt are used as catalysts for the industrial process called [[hydrodesulfurization]], which is implemented on a large scale in [[Oil refinery|refineries]].  Synthetic cobalt sulfides are widely investigated as electrocatalysts.<ref>{{Cite journal|last1=Mathew|first1=Simon|last2=Yella|first2=Aswani|last3=Gao|first3=Peng|last4=Humphry-Baker|first4=Robin|last5=Curchod|first5=Basile F. E.|last6=Ashari-Astani|first6=Negar|last7=Tavernelli|first7=Ivano|last8=Rothlisberger|first8=Ursula|last9=Nazeeruddin|first9=Md. Khaja|title=Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers|journal=Nature Chemistry|volume=6|issue=3|pages=242–247|doi=10.1038/nchem.1861|pmid=24557140|year=2014|bibcode=2014NatCh...6..242M|url=https://zenodo.org/record/12536}}</ref>
 ==Selected literature==
-*{{Cite journal|last=Congiu|first=M.|last2=Albano|first2=L. G. S.|last3=Decker|first3=F.|last4=Graeff|first4=C. F. O.|date=2015-01-01|title=Single precursor route to efficient cobalt sulphide counter electrodes for Dye-sensitized solar cells|url=http://www.sciencedirect.com/science/article/pii/S0013468614021781|journal=Electrochimica Acta|volume=151|pages=517–524|doi=10.1016/j.electacta.2014.11.001}}
+*{{Cite journal|last1=Congiu|first1=M.|last2=Albano|first2=L. G. S.|last3=Decker|first3=F.|last4=Graeff|first4=C. F. O.|date=2015-01-01|title=Single precursor route to efficient cobalt sulphide counter electrodes for Dye-sensitized solar cells|journal=Electrochimica Acta|volume=151|pages=517–524|doi=10.1016/j.electacta.2014.11.001}}
-*{{Cite journal|last=Huo|first=Jinghao|last2=Zheng|first2=Min|last3=Tu|first3=Yongguang|last4=Wu|first4=Jihuai|last5=Hu|first5=Linhua|last6=Dai|first6=Songyuan|date=2015-03-20|title=A high performance cobalt sulfide counter electrode for dye-sensitized solar cells|url=http://www.sciencedirect.com/science/article/pii/S001346861500273X|journal=Electrochimica Acta|volume=159|pages=166–173|doi=10.1016/j.electacta.2015.01.214}}
+*{{Cite journal|last1=Huo|first1=Jinghao|last2=Zheng|first2=Min|last3=Tu|first3=Yongguang|last4=Wu|first4=Jihuai|last5=Hu|first5=Linhua|last6=Dai|first6=Songyuan|date=2015-03-20|title=A high performance cobalt sulfide counter electrode for dye-sensitized solar cells|journal=Electrochimica Acta|volume=159|pages=166–173|doi=10.1016/j.electacta.2015.01.214}}
-*{{Cite journal|last=Congiu|first=M.|last2=Albano|first2=L. G. S.|last3=Decker|first3=F.|last4=Graeff|first4=C. F. O.|date=2015-01-01|title=Single precursor route to efficient cobalt sulphide counter electrodes for dye sensitized solar cells|url=http://www.sciencedirect.com/science/article/pii/S0013468614021781|journal=Electrochimica Acta|volume=151|pages=517–524|doi=10.1016/j.electacta.2014.11.001}}
+*{{Cite journal|last1=Congiu|first1=M.|last2=Albano|first2=L. G. S.|last3=Decker|first3=F.|last4=Graeff|first4=C. F. O.|date=2015-01-01|title=Single precursor route to efficient cobalt sulphide counter electrodes for dye sensitized solar cells|journal=Electrochimica Acta|volume=151|pages=517–524|doi=10.1016/j.electacta.2014.11.001}}
-*{{Cite journal|last=Congiu|first=Mirko|last2=Lanuti|first2=Alessandro|last3=di Carlo|first3=Aldo|last4=Graeff|first4=Carlos F. O.|date=2015-12-01|title=A novel and large area suitable water-based ink for the deposition of cobalt sulfide films for solar energy conversion with iodine-free electrolytes|url=http://www.sciencedirect.com/science/article/pii/S0038092X15004685|journal=Solar Energy|volume=122|pages=87–96|doi=10.1016/j.solener.2015.08.032}}
+*{{Cite journal|last1=Congiu|first1=Mirko|last2=Lanuti|first2=Alessandro|last3=di Carlo|first3=Aldo|last4=Graeff|first4=Carlos F. O.|date=2015-12-01|title=A novel and large area suitable water-based ink for the deposition of cobalt sulfide films for solar energy conversion with iodine-free electrolytes|journal=Solar Energy|volume=122|pages=87–96|doi=10.1016/j.solener.2015.08.032|bibcode=2015SoEn..122...87C|hdl=11449/177482|hdl-access=free}}
-*{{Cite journal|last=Lin|first=Jeng-Yu|last2=Liao|first2=Jen-Hung|last3=Wei|first3=Tzu-Chien|date=2011-04-01|title=Honeycomb-like CoS Counter Electrodes for Transparent Dye-Sensitized Solar Cells|url=http://esl.ecsdl.org/content/14/4/D41|journal=Electrochemical and Solid-State Letters|language=en|volume=14|issue=4|pages=D41–D44|doi=10.1149/1.3533917|issn=1099-0062}}
+*{{Cite journal|last1=Lin|first1=Jeng-Yu|last2=Liao|first2=Jen-Hung|last3=Wei|first3=Tzu-Chien|date=2011-04-01|title=Honeycomb-like CoS Counter Electrodes for Transparent Dye-Sensitized Solar Cells|journal=Electrochemical and Solid-State Letters|language=en|volume=14|issue=4|pages=D41–D44|doi=10.1149/1.3533917|issn=1099-0062}}
-*{{Cite journal|last=Lin|first=Jeng-Yu|last2=Liao|first2=Jen-Hung|last3=Chou|first3=Shu-Wei|date=2011-10-01|title=Cathodic electrodeposition of highly porous cobalt sulfide counter electrodes for dye-sensitized solar cells|url=http://www.sciencedirect.com/science/article/pii/S0013468611011261|journal=Electrochimica Acta|volume=56|issue=24|pages=8818–8826|doi=10.1016/j.electacta.2011.07.080}}
+*{{Cite journal|last1=Lin|first1=Jeng-Yu|last2=Liao|first2=Jen-Hung|last3=Chou|first3=Shu-Wei|date=2011-10-01|title=Cathodic electrodeposition of highly porous cobalt sulfide counter electrodes for dye-sensitized solar cells|journal=Electrochimica Acta|volume=56|issue=24|pages=8818–8826|doi=10.1016/j.electacta.2011.07.080}}
-*{{Cite journal|last=Congiu|first=Mirko|last2=Bonomo|first2=Matteo|last3=Marco|first3=Maria Letizia De|last4=Dowling|first4=Denis P.|last5=Di Carlo|first5=Aldo|last6=Dini|first6=Danilo|last7=Graeff|first7=Carlos F. O.|date=2016-07-16|title=Cobalt Sulfide as Counter Electrode in p-Type Dye-Sensitized Solar Cells|url=http://onlinelibrary.wiley.com/doi/10.1002/slct.201600297/abstract|journal=ChemistrySelect|language=en|volume=1|issue=11|pages=2808–2815|doi=10.1002/slct.201600297|issn=2365-6549}}</ref>
+*{{Cite journal|last1=Congiu|first1=Mirko|last2=Bonomo|first2=Matteo|last3=Marco|first3=Maria Letizia De|last4=Dowling|first4=Denis P.|last5=Di Carlo|first5=Aldo|last6=Dini|first6=Danilo|last7=Graeff|first7=Carlos F. O.|date=2016-07-16|title=Cobalt Sulfide as Counter Electrode in p-Type Dye-Sensitized Solar Cells|journal=ChemistrySelect|language=en|volume=1|issue=11|pages=2808–2815|doi=10.1002/slct.201600297|issn=2365-6549}}
-*{{Cite journal|last=Nattestad|first=Andrew|last2=Ferguson|first2=Michael|last3=Kerr|first3=Robert|last4=Cheng|first4=Yi-Bing|last5=Bach|first5=Udo|title=Dye-sensitized nickel(II)oxide photocathodes for tandem solar cell applications|url=http://stacks.iop.org/0957-4484/19/i=29/a=295304?key=crossref.515819ff1b32ffabda841765b89c5970|journal=Nanotechnology|volume=19|issue=29|doi=10.1088/0957-4484/19/29/295304}}
+*{{Cite journal|last1=Nattestad|first1=Andrew|last2=Ferguson|first2=Michael|last3=Kerr|first3=Robert|last4=Cheng|first4=Yi-Bing|last5=Bach|first5=Udo|title=Dye-sensitized nickel(II)oxide photocathodes for tandem solar cell applications|url=http://stacks.iop.org/0957-4484/19/i=29/a=295304?key=crossref.515819ff1b32ffabda841765b89c5970|journal=Nanotechnology|volume=19|issue=29|pages=295304|doi=10.1088/0957-4484/19/29/295304|year=2008|pmid=21730603|bibcode=2008Nanot..19C5304N|s2cid=30601690 |doi-access=free}} {{Dead link|date=July 2020 |bot=InternetArchiveBot |fix-attempted=yes }}
 ==References==
@@ Line 62: / Line 72: @@
 {{DEFAULTSORT:Cobalt Sulfide}}
-[[Category:Cobalt compounds]]
+[[Category:Cobalt(II) compounds]]
 [[Category:Sulfides]]

v t e Cobalt compounds
Cobalt(I)	HCo(CO)₄
Cobalt(II)	CoBr₂ Co(CN)₂ CoCO₃ CoC₂O₄ CoCl₂ Co(ClO₃)₂ Co(ClO₄)₂ CoF₂ Co(HCO₂)₂ CoI₂ Co(NO₃)₂ Co₃(PO₄)₂ Co(OAc)₂ CoGeO₃ CoO Co(OH)₂ CoS Co(OCN)₂ Co(SCN)₂ CoSO₄ CoSe Co₃P₂ CoH₂ Co(C₃H₆O₃)₂ C ₂₄H ₄₈CoO ₄ C ₃₆H ₇₀CoO ₄
Cobalt(0,III)	CoSi CoGe
Cobalt(II,III)	Co₃O₄
Cobalt(III)	CoAs CoCl₃ Co(NO₃)₃ Co₂O₃ CoF₃ Co(OH)₃ LiCoO₂
Cobalt(III,IV)	Na_xCoO₂
Cobalt(IV)	CoF₄ Cs₂CoF₆ CoC₂₈H₄₄
Cobalt(V)	Na₃CoO₄