Cobalt (II) sulfide

Crystal structure
	__ Co 2+ __ S 2−
Crystal system	hexagonal
Space group	P 6 3 / mmc (No. 194)
Lattice parameters	a = 338 pm, c = 520 pm
General
Surname	Cobalt (II) sulfide
other names	Jaipurite (mineral); Cobalt (II) sulfide; Cobalt monosulfide; Cobalt monosulfide;
Ratio formula	CoS
Brief description	black solid
External identifiers / databases
EC number	215-273-3
ECHA InfoCard	100,013,886
PubChem	14832
Wikidata	Q417806
properties
Molar mass	91.00 g mol −1
Physical state	firmly
density	5.45 g cm −3
Melting point	> 1116 ° C
solubility	practically insoluble in water (3.8 mg l −1 at 18 ° C)
safety instructions
H and P phrases	H: 317-334-350i-410
	P: 261-280-302 + 352-321-363-501
Toxicological data	> 5000 mg kg −1 ( LD 50 , rat , oral )
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Cobalt (II) sulfide is a chemical compound from the group of cobalt compounds and sulfides .

Occurrence

Under the name Syepoorit , James Nicol described a cobalt sulfide with the idealized formula CoS and hexagonal symmetry in 1849 . The name was changed in 1873 by WA Ross to Jeypoorit and in 1880 by FR Mallet finally to Jaipurit . The name refers to the type locality of the so-called ore, the Khetri Mines (Ketri Mine) in the Jhunjhunu district in the Jaipur division in the Indian state of Rajasthan. However, the description of Jaipurit was incomplete and the examination of a sample provided by the British Museum by Paul Ramdohr turned out to be a mixture of mainly cobaltite and other already known ores. Jaipurit's status as an independent mineral is therefore questionable at the moment (as of 2018).

Extraction and presentation

α-Cobalt (II) sulfide can be produced by reacting cobalt (II) nitrate with hydrogen sulfide .

{\ displaystyle \ mathrm {Co (NO_ {3}) _ {2} \ cdot 6 \ H_ {2} O + H_ {2} S \ longrightarrow CoS + 2 \ HNO_ {3} +6 \ H_ {2} O }}

β-Cobalt (II) sulfide can be obtained from the elements by direct synthesis.

{\ displaystyle \ mathrm {Co + S \ longrightarrow CoS}}

It can also be prepared by precipitating a cobalt (II) chloride solution mixed with acetic acid with hydrogen sulfide.

properties

Cobalt (II) sulfide is a non-flammable solid that is insoluble in water. It occurs in two different crystal forms. α-Cobalt (II) sulfide is a black powder, which is soluble in hydrochloric acid and forms Co (OH) S in air. β-cobalt (II) sulfide is a gray powder. It is soluble in acids and is transformed into a more complex modification by prolonged tempering at 200 ° C. It has a crystal structure of the NiAs type ( space group P 6 ₃ / mmc (space group no. 194) , a = 336.7, c = 516.0 pm) and is not built up homogeneously stoichiometrically, so that a composition of CoS _1.04 to CoS _1.13 results. Template: room group / 194

use

Cobalt (II) sulfide is used as a catalyst for the pressure hydrogenation of organic compounds.

Individual evidence

^ ^A ^b Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 85 .
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-61.
↑ ^a ^b ^c ^d ^e ^f ^g Entry on cobalt (II) sulphide in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
↑ Entry on Cobalt sulphide in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
^ Albert Huntington Chester: A dictionary of the names of minerals including their history and etymology . 1st edition. John Wiley & Sons., New York 1896, p. 137 ( available online at archive.org - Internet Archive ).
↑ Type locality Khetri Mine in the Mineralienatlas and at Mindat
↑ Paul Ramdohr : The ore minerals and their adhesions . 4th, revised and expanded edition. Akademie-Verlag, Berlin 1975, p. 660 (Jaipurit).
^ IMA / CNMNC List of Mineral Names; March 2018 (PDF 1.65 MB)
↑ ^a ^b ^c ^d Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1667.

[StrunzNickel-1] A ^b Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 85 .

[CRC_HANDBOOK-2] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-61.

[GESTIS-3] ↑ ^a ^b ^c ^d ^e ^f ^g Entry on cobalt (II) sulphide in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .

[CLP_100.013.886-4] Entry on Cobalt sulphide in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[Chester-5] Albert Huntington Chester: A dictionary of the names of minerals including their history and etymology . 1st edition. John Wiley & Sons., New York 1896, p. 137 ( available online at archive.org - Internet Archive ).

[TyplokalitätKhetriMine-6] Type locality Khetri Mine in the Mineralienatlas and at Mindat

[Ramdohr-7] Paul Ramdohr : The ore minerals and their adhesions . 4th, revised and expanded edition. Akademie-Verlag, Berlin 1975, p. 660 (Jaipurit).

[IMA-Liste-2018-03-8] IMA / CNMNC List of Mineral Names; March 2018 (PDF 1.65 MB)

[Brauer-9] Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1667.