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Sigma-Aldrich

Rhodium

powder, 99.95% trace metals basis

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About This Item

Empirical Formula (Hill Notation):
Rh
CAS Number:
7440-16-6
Molecular Weight:
102.91
EC Number:
231-125-0
MDL number:
MFCD00011201
UNSPSC Code:
12141738
PubChem Substance ID:
24852239
NACRES:
NA.23

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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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

4.1B - Flammable solid hazardous materials

wgk_germany

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

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

Certificates of Analysis (COA)

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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
Gavin Chit Tsui et al.
Organic letters, 15(5), 1064-1067 (2013-02-12)
A method for synthesizing chiral oxazolidinone scaffolds from readily available oxabicyclic alkenes is described. The reaction utilizes a domino sequence of Rh(I)-catalyzed asymmetric ring-opening (ARO) with sodium cyanate as a novel nucleophile followed by intramolecular cyclization to generate oxazolidinone products
Xian-Ying Shi et al.
Organic letters, 15(7), 1476-1479 (2013-03-09)
A novel rhodium(III)-catalyzed direct functionalization of the ortho-C-H bond of aromatic ketone derivatives and an intramolecular cyclization sequence produced indene derivatives in moderate to good yields. This cascade cyclization involves a conjugate addition of α,β-unsaturated ketone and subsequent aldol condensation.
P Andrew Evans et al.
Organic letters, 15(8), 1798-1801 (2013-04-02)
A concise and highly convergent three-step total synthesis of the lactarane natural product, pyrovellerolactone, is described. The key step involves a regio- and diastereoselective rhodium-catalyzed [(3 + 2) + 2] carbocyclization of an alkenylidenecyclopropane with a 4-hydroxybut-2-ynoate followed by an
Juliane Keilitz et al.
Organic letters, 15(5), 1148-1151 (2013-02-21)
A new enantioselective rhodium-catalyzed domino reaction is described that gives access to fused heterocycles by desymmetrization of alkyne-tethered cyclohexadienones. Two new C-C bonds and two stereocenters are formed in one step with good enantioselectivity. In contrast to prior reports, it
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