Cobalt disulfide

Crystal structure
__ Co 2+      __ __ S 2 2−
Space group	Room group Pa 3 (room group no.205)
General
Surname	Cobalt disulfide
other names	Cobalt disulfide
Ratio formula	CoS 2
Brief description	black odorless solid
External identifiers / databases
CAS number 12013-10-4 EC number 682-014-2 ECHA InfoCard 100.207.127 PubChem 19601219 ChemSpider 21247611 Wikidata Q1104482
properties
Molar mass	123.06 g mol −1
Physical state	firmly
density	4.23 g cm −3
solubility	practically insoluble in water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 317-410 P: 280-302 + 352-333 + 313
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Cobalt disulfide is a chemical compound from the group of cobalt compounds and disulfides .

Occurrence

Cobalt disulfide occurs naturally in the form of the mineral cattierite .

Extraction and presentation

Cobalt disulfide can be prepared directly from the elements .

${\displaystyle \mathrm {Co+2\ S\longrightarrow CoS_{2}} }$

It can also be obtained by the action of hydrogen sulfide on cobalt (III) complex compounds .

Single crystals of the compound, with a size of 3 to 4 mm and almost perfect crystal faces, can be obtained through a cyclic chemical transport reaction lasting several weeks in a 3-zone furnace, based on polycrystalline cobalt disulfide, a small amount of sulfur and chlorine :

${\displaystyle {\ce {CoS2 + Cl2 <-> CoCl2 + S2}}}$

properties

Cobalt disulfide is a black, odorless, non-flammable solid that is practically insoluble in water. It has a crystal structure of the pyrite type (i.e. cubic crystal system , space group Pa 3 (space group no. 205) , lattice parameter a = 553.5  pm , there are four formula units in the unit cell ). Cobalt disulfide contains divalent cobalt ions and the disulfide ion S ₂ ²⁻ corresponding to iron disulfide . It is not attacked by non-oxidizing acids or alkalis and when heated in the absence of air, sulfur is split off.

Below its Curie temperature of 124 K, the compound shows ferromagnetic behavior.

use

Cobalt disulfide is used as a catalyst in organic synthesis.

Individual evidence

1. ↑ ^{a b c d e f} Entry on cobalt disulphide in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
2. ↑ Cattierite (Mindat)
3. ↑ ^{a b c} Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1667.
4. ↑ ^{a b} R. J. Bouchard: Growth of cobalt disulfide single crystals . In: Aaron Wold and John K. Ruff (Eds.): Inorganic Syntheses . tape 14 . McGraw-Hill Book Company, Inc., 1973, ISBN   07-071320-0  ( defective ) , p. 157-160 (English).
5. ^ Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists. 3. Elements, inorganic compounds and materials, minerals, Volume 3. 4. Edition, Springer, 1997, ISBN 978-3-540-60035-0 , p. 388 ( limited preview in Google book search).
6. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1690.