Chromium (III) sulfide

Crystal structure
	__ Cr 3+ __ S 2−
General
Surname	Chromium (III) sulfide
other names	Dichromium trisulfide; Chromium sulfide (ambiguous);
Ratio formula	Cr 2 S 3
Brief description	brown odorless solid
External identifiers / databases
EC number	234-638-8
ECHA InfoCard	100,031,477
PubChem	159397
Wikidata	Q1809040
properties
Molar mass	200.18 g mol −1
Physical state	firmly
density	3.77 g cm −3
Melting point	1350 ° C
solubility	almost insoluble in water; Easily soluble in nitric acid;
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 302-332-317
	P: 261-280-302 + 352-321-304 + 340-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (III) sulfide is an inorganic chemical compound of chromium from the group of sulfides .

Extraction and presentation

Chromium (III) sulfide can be produced by reacting a stoichiometric mixture of chromium and sulfur at 1000 ° C

{\ displaystyle \ mathrm {2 \ Cr + 3 \ S \ longrightarrow Cr_ {2} S_ {3}}}

or from chromium (III) chloride or chromium (III) oxide with hydrogen sulfide at 650 ° C.

{\ displaystyle \ mathrm {2 \ CrCl_ {3} +3 \ H_ {2} S \ longrightarrow Cr_ {2} S_ {3} +6 \ HCl}}

properties

Chromium (III) sulfide is a brown, odorless solid that is insoluble in water. It has a trigonal crystal structure with the space group P 3 1 c (space group no.163) . This corresponds to the nickel arsenide type , with 2/3 ordered voids being present in every second layer. When the compound melts, it decomposes to form chromium (II) sulfide , releasing sulfur , and other phases such as Cr ₃ S ₄ , Cr ₅ S ₆ and Cr ₇ S ₈ are also formed in the meantime . Chromium (III) sulfide is resistant to non-oxidizing acids , but converts to chromium (VI) compounds with oxidizing alkaline solutions . When alkali sulfides are melted with chromium (III) sulfide, thiochromates (III) are formed. Template: room group / 163

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h data sheet Chromium (III) sulfide, 99% (metals basis) from AlfaAesar, accessed on June 29, 2013 ( PDF )(JavaScript required) .
↑ ^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. 1493.
^ ^A ^b A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1451.
↑ Roger Blachnik (Ed.): Paperback for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 406 ( limited preview in Google Book search).
↑ Erwin Riedel, Christoph Janiak: Inorganic Chemistry . Walter de Gruyter, 2011, ISBN 3-11-022566-2 , p. 732 ( limited preview in Google Book search).
^ Mary Eagleson: Concise Encyclopedia Chemistry . Walter de Gruyter, 1994, ISBN 3-11-011451-8 , p. 225 ( limited preview in Google Book Search).

[Alfa-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h data sheet Chromium (III) sulfide, 99% (metals basis) from AlfaAesar, accessed on June 29, 2013 ( PDF )(JavaScript required) .

[brauer-2] 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. 1493.

[HoWi-3] A ^b A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1451.

[Ellen_Lax-4] Roger Blachnik (Ed.): Paperback for chemists and physicists . Volume III: Elements, Inorganic Compounds and Materials, Minerals . founded by Jean d'Ans, Ellen Lax. 4th, revised and revised edition. Springer, Berlin 1998, ISBN 3-540-60035-3 , pp. 406 ( limited preview in Google Book search).

[Erwin_Riedel,_Christoph_Janiak-5] Erwin Riedel, Christoph Janiak: Inorganic Chemistry . Walter de Gruyter, 2011, ISBN 3-11-022566-2 , p. 732 ( limited preview in Google Book search).

[Mary_Eagleson-6] Mary Eagleson: Concise Encyclopedia Chemistry . Walter de Gruyter, 1994, ISBN 3-11-011451-8 , p. 225 ( limited preview in Google Book Search).