Molybdenum (II) chloride

Crystal structure
__ Mo 2+      __ Cl -
General
Surname	Molybdenum (II) chloride
other names	Molybdenum dichloride
Ratio formula	MoCl 2
Brief description	yellow solid
External identifiers / databases
CAS number 13478-17-6 EC number 236-774-3 ECHA InfoCard 100.033.417 PubChem 83514 ChemSpider 75349 Wikidata Q3680968
properties
Molar mass	166.845 g mol −1
Physical state	firmly
density	3.71 g cm −3
Melting point	530 ° C (decomposition)
solubility	slow hydrolysis in water soluble in ethanol and diethyl ether
safety instructions
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 (II) chloride is an inorganic chemical compound of molybdenum from the group of chlorides .

Extraction and presentation

Molybdenum (II) chloride can be obtained by

• Pyrolysis of molybdenum (III) chloride

${\displaystyle \mathrm {12\ MoCl_{3}\longrightarrow [Mo_{6}Cl_{8}]Cl_{4}+6\ MoCl_{4}} }$

• the reaction of molybdenum with phosgene

${\displaystyle \mathrm {6Mo+6\ COCl_{2}\longrightarrow [Mo_{6}Cl_{8}]Cl_{4}+6\ CO} }$

• or the reaction of molybdenum (IV) chloride with elemental molybdenum

${\displaystyle {\ce {3 MoCl4 + 3 Mo -> (Mo6Cl8)Cl4}}}$

properties

Molybdenum (II) chloride is a yellow, diamagnetic, air-resistant, hygroscopic powder that is insoluble in water , glacial acetic acid , toluene and gasoline . It is soluble in ethanol , ether , acetone , pyridine , dilute strong bases and concentrated hydrochloric acid . It has an orthorhombic crystal structure with the space group Bbem (space group no. 64, position 5) , a = 1124.9 pm, b = 1128.0 pm, c = 1406.7 pm.

Molybdenum (II) chloride MoCl ₂ (Mo ₆ Cl ₁₂ ) contains an octahedral Mo ₆ cluster and thus belongs to the metal clusters . The reactions and the physical properties of molybdenum halide complexes with a {Mo ₆ X ₈ } ⁴⁺ cluster core (X = Cl, Br) were determined by a long-lived luminescence of some analogous compounds and their structural similarity to superconducting Chevrel-Sergent- Phases intensively researched. Molybdenum (II) chloride has a polymeric structure and can be described by the formula [{Mo ₆ Cl ₈ } Cl _4/2 Cl ₂ ] _∞ . In the structure, the {Mo ₆ Cl ₈ } ⁴⁺ cluster cores are connected by chloride ligands to form infinite layers.

Individual evidence

1. ↑ ^{a b c d e f} Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1531 .
2. ^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 491 ( limited preview in Google Book search).
3. ↑ ^{a b c} Piero Nannelli and BP Block: Molybdenum (II) halides - A. Molybdenum (II) chloride . In: Robert W. Parry (Ed.): Inorganic Syntheses . tape 12 . McGraw-Hill Book Company, Inc., 1970, ISBN   07-048517-8  ( defective ) , p. 170-178 (English).
4. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
5. ↑ The former name of this group of rooms was Bbam .
6. ↑ Ralf Alsfasser, HJ Meyer: Moderne Anorganische Chemie . Walter de Gruyter, 2007, ISBN 3-11-019060-5 , p. 353 ff . ( limited preview in Google Book search).
7. ↑ Zh. S. Kozhomuratova, NG Naumov, D. Yu. Naumov, EM Uskov, VE Fedorov: Octahedral cluster Mo complexes (Bz3NH) 3 [Mo6OCl13] and (Bz3NH) 2 [Mo6Cl14] ‚· 2CH3CN: Synthesis, crystal structure and properties. In: Russian Journal of Coordination Chemistry. 33, 2007, pp. 213-221, doi : 10.1134 / S1070328407030104 .