Molybdenum (IV) chloride

Crystal structure
	__ Mo 4+ __ Cl -; crystal structure of α-MoCl 4
General
Surname	Molybdenum (IV) chloride
other names	Molybdenum tetrachloride
Ratio formula	MoCl 4
Brief description	black solid
External identifiers / databases
EC number	236-358-1
ECHA InfoCard	100.033.039
PubChem	83340
ChemSpider	75200
Wikidata	Q2350349
properties
Molar mass	237.75 g mol −1
Physical state	firmly
density	3.193 g cm −3
Melting point	272 ° C (decomposition)
solubility	soluble in water; soluble in concentrated sulfuric acid and nitric acid;
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Molybdenum (IV) chloride is an inorganic chemical compound of molybdenum from the group of chlorides .

Extraction and presentation

Molybdenum (IV) chloride can be obtained by reacting molybdenum (V) chloride with benzene , molybdenum (III) chloride or tetrachlorethylene .

{\ displaystyle \ mathrm {2 \ MoCl5 + C_ {6} H_ {6} \ longrightarrow 2 \ MoCl_ {4} + C_ {6} H_ {5} Cl + HCl}}

{\ displaystyle \ mathrm {MoCl_ {5} + MoCl_ {3} \ longrightarrow 2 \ MoCl_ {4}}}

{\ displaystyle {\ ce {2 MoCl5 + C2Cl4 -> 2 MoCl4 + C2Cl6}}}

properties

Molybdenum (IV) chloride is a paramagnetic , light-, air- and moisture-sensitive black powder or black-brown, hexagonal columns. It is extremely susceptible to hydrolysis and dissolves in water, ethanol and ether without leaving any residue with a yellow to red-brown color . When heated to over 180 ° C in a vacuum, it is volatile with partial decomposition into molybdenum (III) chloride and molybdenum (V) chloride. It has a trigonal crystal structure with the space group P 3 1 c (space group no. 163) , a = 605.8 pm, c = 1167.4 pm. The compound (α-form with chains of trans-edge-linked MoCl ₆ octahedra) is converted at 250 ° C into the β-form, which consists of rings of six cis-edge-linked MoCl ₆ octahedra. When dissolved in concentrated hydrochloric acid, it forms complex salts with alkali chlorides, such as the apple-green cesium pentachlorooxomolybdate (V) Cs ₂ [MoOCl ₅ ]. Template: room group / 163

Individual evidence

↑ ^a ^b ^c ^d ^e Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1533 .
↑ ^a ^b ^c ^d Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 574 ( limited preview in Google Book search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ EL McCann III and TM Brown: Molybdenum (IV) chloride . In: Robert W. Parry (Ed.): Inorganic Syntheses . tape 12 . McGraw-Hill Book Company, Inc., 1970, ISBN 07-048517-8 ( defective ) , p. 181-186 (English).
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1470.

[brauer-1] Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1533 .

[Lax-2] Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 574 ( limited preview in Google Book search).

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[IS12-4] EL McCann III and TM Brown: Molybdenum (IV) chloride . In: Robert W. Parry (Ed.): Inorganic Syntheses . tape 12 . McGraw-Hill Book Company, Inc., 1970, ISBN 07-048517-8 ( defective ) , p. 181-186 (English).

[Arnold_F._Holleman,_Egon_Wiberg,_Nils_Wiberg-5] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1470.