Molybdenum (III) chloride

Crystal structure
	__ Mo 3+ __ Cl -; crystal structure of α-MoCl 3
General
Surname	Molybdenum (III) chloride
other names	Molybdenum trichloride
Ratio formula	MoCl 3
Brief description	red solid
External identifiers / databases
EC number	236-775-9
ECHA InfoCard	100.033.418
PubChem	83515
ChemSpider	75350
Wikidata	Q4498220
properties
Molar mass	202.30 g mol −1
Physical state	firmly
density	3.58 g cm −3 (25 ° C)
Melting point	410 ° C (decomposition)
solubility	almost insoluble in water, acetone, carbon tetrachloride and benzene; Slightly soluble in diethyl ether, iso-propanol and pyridine;
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319-335
	P: 261-305 + 351 + 338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

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

Extraction and presentation

Molybdenum (III) chloride can be obtained by reacting molybdenum (V) chloride with hydrogen , tin (II) chloride or metallic molybdenum.

{\ displaystyle \ mathrm {MoCl_ {5} + H_ {2} \ longrightarrow MoCl_ {3} + HCl}}

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

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

properties

Molybdenum (III) chloride is a copper-red to brown powder that can be kept indefinitely at room temperature under protective gas. Slow hydrolysis and oxidation occurs in moist air . It is insoluble in water, dilute hydrochloric acid, acetone, carbon tetrachloride, benzene and ethanol, but soluble in dilute nitric acid and concentrated sulfuric acid . Above 410 ° C, disproportionation occurs in molybdenum (II) chloride and molybdenum (IV) chloride . The connection comes in two modifications. The α-form has a monoclinic crystal structure similar to that of the aluminum (III) chloride type with the space group C 2 / m (space group no. 12) , a = 609.2 pm, b = 974.5 pm, c = 727.5 pm, β = 124.6 °. This shape consists of MoCl ₆ octahedra, each octahedron being linked to three neighboring octahedra via edges. The distance to one of the neighboring Mo atoms is 274.7 pm, which implies a covalent Mo – Mo bond. The β-form also has a monoclinic crystal structure with the space group C 2 / c (No. 15) , a = 611.5 pm, b = 981.4 pm, c = 1190.6 pm, β = 91.0 °. There is also a trihydrate. Template: room group / 12Template: room group / 15

Individual evidence

↑ ^a ^b ^c ^d ^e ^f data sheet Molybdenum (III) chloride, 99.95% trace metals basis from Sigma-Aldrich , accessed on July 2, 2013 ( PDF ).
↑ ^a ^b ^c Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1531 .
^ ^A ^b Alan K. Mallock: Molybdenum (III) chloride . In: Robert W. Parry (Ed.): Inorganic Syntheses . tape 12 . McGraw-Hill Book Company, Inc., 1970, ISBN 07-048517-8 ( defective ) , p. 178-181 (English).
^ Hermann Jehn, Wolfgang Kurtz, Dietrich Schneider, Ursula Trobisch, Joachim Wagner: Mo Molybdenum . Springer Science & Business Media, 2013, ISBN 978-3-662-06327-9 , pp. 281 ( limited preview in Google Book search).

[Sigma-1] ↑ ^a ^b ^c ^d ^e ^f data sheet Molybdenum (III) chloride, 99.95% trace metals basis from Sigma-Aldrich , accessed on July 2, 2013 ( PDF ).

[brauer-2] Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1531 .

[IS12-3] A ^b Alan K. Mallock: Molybdenum (III) chloride . In: Robert W. Parry (Ed.): Inorganic Syntheses . tape 12 . McGraw-Hill Book Company, Inc., 1970, ISBN 07-048517-8 ( defective ) , p. 178-181 (English).

[Hermann_Jehn,_Wolfgang_Kurtz,_Dietrich_Schneider,_Ursula_Trobisch,_Joachim_Wagner-4] Hermann Jehn, Wolfgang Kurtz, Dietrich Schneider, Ursula Trobisch, Joachim Wagner: Mo Molybdenum . Springer Science & Business Media, 2013, ISBN 978-3-662-06327-9 , pp. 281 ( limited preview in Google Book search).