Molybdenum (V) fluoride

Crystal structure
	__ Mon 5+ __ F -
General
Surname	Molybdenum (V) fluoride
other names	Molybdenum pentafluoride
Ratio formula	MoF 5
Brief description	yellow solid
External identifiers / databases
PubChem	139613
ChemSpider	123127
Wikidata	Q4493212
properties
Molar mass	190.94 g mol −1
Physical state	firmly
density	3.5 g cm −3
Melting point	45 ° C
boiling point	212 ° C
solubility	Hydrolysis on contact with water; Soluble in dimethyl ether and acetonitrile with formation of corresponding addition compounds;
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 (V) fluoride is an inorganic chemical compound of molybdenum from the group of fluorides .

Extraction and presentation

Molybdenum (V) fluoride can be obtained by reacting molybdenum hexacarbonyl with fluorine at −78 ° C.

{\ displaystyle \ mathrm {2 \ Mo (CO) _ {6} +5 \ F_ {2} \ longrightarrow 2 \ MoF_ {5} +12 \ CO}}

Alternatively, the representation is made by reacting elemental molybdenum with molybdenum (VI) fluoride at 60 ° C with a yield of 75 - 80%:

{\ displaystyle {\ ce {Mon + 5 MoF6 -> [T] [] 6 MoF5}}}

properties

Molybdenum (V) fluoride is a yellow, hydrolysis-sensitive solid that smokes in the air. Its crystal structure can be described as a cyclic tetramer [MoF ₅ ] ₄ made of distorted octahedra. It is the namesake of the MoF ₅ structure type.

The melting temperature of over 60 ° C given in the literature contradicts more recent values of about 45 ° C determined both thermographically and visually in a thin-walled quartz capillary. The lack of a full chemical analysis in the older sources suggests the presence of admixtures of molybdenum (VI) oxide fluoride MoOF ₄ (melting point 98 ° C) in the synthesized preparations, which can significantly increase the melting point.

Individual evidence

↑ ^a ^b ^c ^d Georg Brauer , with the assistance of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 266 .
↑ ^a ^b web elements: Periodic Table of the Elements | Molybdenum | tetramolybdenum_eicosafluoride
↑ ^a ^b ya. V. Vasil'ev, AA Opalovskii, KA Khaldoyanidi: Magnetic properties of molybdenum pentafluoride. In: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 18, 1969, p. 231, doi : 10.1007 / BF00905525 .
↑ ^a ^b ^c T. J. Ouellette et al .: Molybdenum (V) fluoride (Molybdenum pentalfluoride) . In: FA Cotton (Ed.): Inorganic Syntheses . tape 13 . McGraw-Hill Book Company, Inc., 1972, ISBN 07-013208-9 ( defective ) , p. 146-1150 (English).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
^ AJ Edwards, RD Peacock, RWH Small: The Preparation and Structure of Molybdenum Pentafluoride . In: J. Chem. Soc. 1962, p. 4486-4491 .
^ Ralph F. Krause, Thomas B. Douglas: The melting temperature, vapor density, and vapor pressure of molybdenum pentafluoride. In: The Journal of Chemical Thermodynamics. 9, 1977, p. 1149, doi : 10.1016 / 0021-9614 (77) 90116-1 .

[brauer-1] Georg Brauer , with the assistance of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 266 .

[webelements-2] web elements: Periodic Table of the Elements | Molybdenum | tetramolybdenum_eicosafluoride

[DOI10.1007/BF00905525-3] ya. V. Vasil'ev, AA Opalovskii, KA Khaldoyanidi: Magnetic properties of molybdenum pentafluoride. In: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 18, 1969, p. 231, doi : 10.1007 / BF00905525 .

[IS13-4] T. J. Ouellette et al .: Molybdenum (V) fluoride (Molybdenum pentalfluoride) . In: FA Cotton (Ed.): Inorganic Syntheses . tape 13 . McGraw-Hill Book Company, Inc., 1972, ISBN 07-013208-9 ( defective ) , p. 146-1150 (English).

[NV-5] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[6] AJ Edwards, RD Peacock, RWH Small: The Preparation and Structure of Molybdenum Pentafluoride . In: J. Chem. Soc. 1962, p. 4486-4491 .

[DOI10.1016/0021-9614(77)90116-1-7] Ralph F. Krause, Thomas B. Douglas: The melting temperature, vapor density, and vapor pressure of molybdenum pentafluoride. In: The Journal of Chemical Thermodynamics. 9, 1977, p. 1149, doi : 10.1016 / 0021-9614 (77) 90116-1 .