Hexamethyl tungsten

Structural formula
General
Surname	Hexamethyl tungsten
Molecular formula	W (CH 3 ) 6
Brief description	dark red solid
External identifiers / databases
CAS number 36133-73-0 PubChem 142049 Wikidata Q2031142
properties
Molar mass	274.1 g mol −1
Physical state	firmly
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 .

Hexamethyl tungsten is a chemical compound of tungsten from the group of organometallic compounds .

Extraction and presentation

Hexamethyl tungsten can be obtained by reacting tungsten (VI) chloride with trimethyl aluminum .

${\displaystyle \mathrm {WCl_{6}+6\ Al(CH_{3})_{3}\longrightarrow W(CH_{3})_{6}+6\ Al(CH_{3})_{2}Cl} }$

The preparation by reaction of tungsten (VI) chloride and methyllithium is possible, but unsatisfactory because of the difficult to control and reproducible reaction conditions.

properties

Hexamethyl tungsten is a dark red, very volatile, crystalline solid that begins to slowly decompose from −40 ° C, but can be stored below this temperature for a longer period of time. Its solutions can survive a few days at −25 ° C without noticeable decomposition and can even be used for a short time at room temperature.

Individual evidence

1. ↑ ^{a b c d e} 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. 1916.
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.