Tetrarhodium dodecacarbonyl

Structural formula
General
Surname	Tetrarhodium dodecacarbonyl
other names	Rhodium dodecarbonyl Dodecacarbonyl tetrarhodium Tetrarhodium dodecacarbonyl
Molecular formula	[Rh 4 (CO) 12 ]
Brief description	orange solid
External identifiers / databases
CAS number 19584-30-6 EC number 243-171-9 ECHA InfoCard 100.039.232 PubChem 16212430 Wikidata Q4164130
properties
Molar mass	747.74 g mol −1
Physical state	firmly
Melting point	~ 75 ° C
boiling point	~ 150 ° C (decomposition)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-312-332 P: 280
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Tetrarhodium dodecarbonyl is a complex compound of rhodium from the group of metal carbonyls .

Extraction and presentation

Tetrarhodium dodecarbonyl can be obtained by reacting dirhodium tetracarbonyl dichloride with carbon monoxide .

${\displaystyle \mathrm {2\ [RhCl(CO)_{2}]_{2}+4\ CO\longrightarrow [Rh_{4}(CO)_{12}]} }$

The synthesis by high pressure carbonylation of anhydrous rhodium (III) chloride at 50-80 ° C in the presence of copper , cadmium or tin as an auxiliary metal is also possible.

properties

Tetrarhodiumdodecarbonyl is an orange to red, air-stable solid that is sparingly soluble in aliphatic solvents and moderately soluble in benzene and diethyl ether . It decomposes when exposed to concentrated acids and bases, in the latter with metal separation. At 100 ° C., decomposition takes place in a nitrogen atmosphere with the formation of hexarhodiumhexadecacarbonyl [Rh ₆ (CO) ₁₆ ].

use

Tetrarhodium dodecarbonyl is used as a starting material for the production of rhodium catalysts .

Individual evidence

1. ↑ ^{a b c d e} data sheet Tetrarhodium dodecacarbonyl from Sigma-Aldrich , accessed on September 12, 2013 ( PDF ).
2. ↑ ^{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. 1836.
3. ↑ Jean -Marie Basset, Rinaldo Psaro, Dominique Roberto, Renato Ugo: Modern Surface Organometallic Chemistry . John Wiley & Sons, 2009, ISBN 3-527-62710-3 , pp. 334 ( limited preview in Google Book search).