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204218

Sigma-Aldrich

Rhodium

powder, 99.95% trace metals basis

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About This Item

Fórmula empírica (notación de Hill):
Rh
Número de CAS:
7440-16-6
Peso molecular:
102.91
Número CE:
231-125-0
Número MDL:
MFCD00011201
Código UNSPSC:
12141738
ID de la sustancia en PubChem:
24852239
NACRES:
NA.23

Nivel de calidad

100

Ensayo

99.95% trace metals basis

Formulario

powder

resistividad

4.33 μΩ-cm, 20°C

bp

3727 °C (lit.)

mp

1966 °C (lit.)

densidad

12.41 g/cm3 (lit.)

cadena SMILES

[Rh]

InChI

1S/Rh

Clave InChI

MHOVAHRLVXNVSD-UHFFFAOYSA-N

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Descripción general

Rhodium is one of the rarest metals from the platinum group, found in very small quantities in the earth′s crust (0.2 parts per billion). Rhodium’s chemical properties are related to its unusual ground state valence electron configuration in which it has only one electron in its outermost s orbital. This electron configuration has important implications for its catalytic ability, which has made rhodium useful in catalytic converters for automobiles. At the same time, metallic rhodium is a noble metal, meaning it has outstanding resistance to oxidation.

The powder form of rhodium is a silvery-grey and is used not just in the auto industry, but also in other areas like chemical synthesis and powder metallurgy. Rhodium is harder and melts at higher temperatures than both platinum and palladium, which makes it’s a useful hardening element in alloys. Additionally, it is popular for coating jewelry and other items because it gives a shiny, protective layer that does not easily wear away.

Aplicación

Rhodium can be used in the following applications:
  • Rh supported on activated carbon (Rh/C) can be used as an efficient oxygen reduction reaction catalyst for the fabrication of microbial fuel cells.
  • Used as a catalyst in the hydrosilylation of aromatic nitriles to N, N-disilylamines.
  • Used to prepare Rhodium-Iridium alloy.

Código de clase de almacenamiento

4.1B - Flammable solid hazardous materials

Clase de riesgo para el agua (WGK)

nwg

Punto de inflamabilidad (°F)

Not applicable

Punto de inflamabilidad (°C)

Not applicable

Equipo de protección personal

Eyeshields, Gloves, type P3 (EN 143) respirator cartridges

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Certificados de análisis (COA)

Lot/Batch Number
MKCQ0506
MKCP6780
MKCP1979
MKCN7851

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Rhodium on alumina extent of labeling: 5 wt. % loading, matrix alumina support, powder

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212857

Rhodium on alumina

Platinum powder, 99.995% trace metals basis

Sigma-Aldrich

204013

Platinum

Osmium powder, 99.9% trace metals basis

Sigma-Aldrich

263257

Osmium

Rhodium on carbon extent of labeling: 5 wt. % loading

Sigma-Aldrich

206164

Rhodium on carbon

Stepan Chuprakov et al.
Journal of the American Chemical Society, 135(12), 4652-4655 (2013-03-13)
Readily available 1-mesyl-1,2,3-triazoles are efficiently converted into a variety of imidazolones and thiazoles by Rh(II)-catalyzed denitrogenative reactions with isocyanates and isothiocyanates, respectively. The proposed triazole-diazoimine equilibrium results in the formation of highly reactive azavinyl metal-carbenes, which react with heterocumulenes causing
Vutukuri Prakash Reddy et al.
Organic letters, 15(6), 1290-1293 (2013-02-28)
A straightforward and efficient method for the rhodium-catalyzed intermolecular oxidative cross-coupling of arenes and heteroarenes with thio- and selenophene derivatives (chalcogenophenes) via double C-H bond cleavage has been developed by using Cu(OAc)2/AgSbF6 as an oxidant. The reaction is applicable to
Brendan T Parr et al.
Journal of the American Chemical Society, 135(12), 4716-4718 (2013-03-13)
The synthesis of highly functionalized pyrroles has been achieved by reaction of rhodium-stabilized imino-carbenes with furans. The reaction features an initial [3+2] annulation to form bicyclic hemiaminals, followed by ring opening to generate trisubstituted pyrroles.
Simon Duttwyler et al.
Science (New York, N.Y.), 339(6120), 678-682 (2013-02-09)
Piperidines are prevalent in natural products and pharmaceutical agents and are important synthetic targets for drug discovery and development. We report on a methodology that provides highly substituted piperidine derivatives with regiochemistry selectively tunable by varying the strength of acid
Rh/Pd catalysis with chiral and achiral ligands: domino synthesis of aza-dihydrodibenzoxepines.
Adam A Friedman et al.
Angewandte Chemie (International ed. in English), 52(37), 9755-9758 (2013-07-23)
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