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204218

Sigma-Aldrich

Rhodium

powder, 99.95% trace metals basis

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Empirical Formula (Hill Notation):
Rh
CAS Number:
Molecular Weight:
102.91
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.23

Quality Level

Assay

99.95% trace metals basis

form

powder

resistivity

4.33 μΩ-cm, 20°C

bp

3727 °C (lit.)

mp

1966 °C (lit.)

density

12.41 g/cm3 (lit.)

SMILES string

[Rh]

InChI

1S/Rh

InChI key

MHOVAHRLVXNVSD-UHFFFAOYSA-N

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1 of 4

This Item
GF14938005GF49946417GF22634120
Rhodium powder, 99.95% trace metals basis

Sigma-Aldrich

204218

Rhodium

Rhodium microfoil, disks, 25mm, thinness 0.1μm, specific density 124μg/cm2, permanent mylar 3.5μm support, 99.9%

GF14938005

Rhodium

Rhodium microfoil, disks, 10mm, thinness 0.50μm, specific density 620μg/cm2, permanent mylar 3.5μm support, 99.99%

GF49946417

Rhodium

Rhodium foil, not light tested, 50x50mm, thickness 0.00075mm, permanent polyester support, 99.85%

GF22634120

Rhodium

form

powder

form

foil

form

foil

form

foil

resistivity

4.33 μΩ-cm, 20°C

resistivity

4.33 μΩ-cm, 20°C

resistivity

4.33 μΩ-cm, 20°C

resistivity

4.33 μΩ-cm, 20°C

bp

3727 °C (lit.)

bp

3727 °C (lit.)

bp

3727 °C (lit.)

bp

3727 °C (lit.)

mp

1966 °C (lit.)

mp

1966 °C (lit.)

mp

1966 °C (lit.)

mp

1966 °C (lit.)

density

12.41 g/cm3 (lit.)

density

12.41 g/cm3 (lit.)

density

12.41 g/cm3 (lit.)

density

12.41 g/cm3 (lit.)

General description

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.

Application

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.

Storage Class Code

4.1B - Flammable solid hazardous materials

WGK

nwg

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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25G
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705578-5MG-PW

PL860-CGA/SHF-1EA

MMYOMAG-74K-13

1000309185

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

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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
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
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.
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
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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