Hexarhodium hexadecacarbonyl

Structural formula
General
Surname	Hexarhodium hexadecacarbonyl
other names	Hexadecacarbonyl hexarhodium Rhodium carbonyl
Molecular formula	[Rh 6 (CO) 16 ]
Brief description	dark solid
External identifiers / databases
CAS number 28407-51-4 EC number 249-009-3 ECHA InfoCard 100,044,539 PubChem 10866043 Wikidata Q1092934
properties
Molar mass	1065.60 g mol −1
Physical state	firmly
Melting point	> 300 ° C
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-312-332 P: 261-280-302 + 352-304 + 340-322-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Hexarhodiumhexadecacarbonyl is a chemical compound of rhodium from the group of metal carbonyls .

Extraction and presentation

Hexarhodiumhexadecacarbonyl can be produced by reacting dirhodium tetraacetate with carbon monoxide and water

${\displaystyle \mathrm {3\ [Rh(CH_{3}CO_{2})_{2}]_{2}+22\ CO+6\ H_{2}O\longrightarrow [Rh_{6}(CO)_{16}]+6\ CO_{2}+12\ CH_{3}CO_{2}H} }$

or by pressure carbonylation of rhodium (III) chloride trihydrate with carbon monoxide.

${\displaystyle \mathrm {6\ RhCl_{3}\cdot \ 3\ H_{2}O+25\ CO\longrightarrow [Rh_{6}(CO)_{16}]+9\ COCl_{2}+18\ H_{2}O} }$

properties

Hexarhodiumhexadecacarbonyl is a violet-brown (larger crystals appear black), air-resistant crystalline solid with a surface sheen. It is insoluble in aliphatic solvents , slightly soluble in all other common solvents. It is resistant to diluted acids and alkalis. When heated above 200 ° C it begins to decompose. In air above 220 ° C, a shiny metal film forms on the surface.

use

Hexarhodiumhexadecacarbonyl can be used as a catalyst in organic chemistry.

Individual evidence

1. ↑ ^{a b c d e f} data sheet Hexarhodium hexadecacarbonyl, 98% from AlfaAesar, accessed on September 12, 2013 ( PDF )(JavaScript required) .
2. ↑ ^{a b c} 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. 1838.
3. ^ CJ Moody: Advances in Nitrogen Heterocycles . Elsevier, 1999, ISBN 0-08-056076-8 , pp. 136 ( limited preview in Google Book search).