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Sigma-Aldrich

Rhodium

powder, 99.95% trace metals basis

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About This Item

Empirische Formel (Hill-System):
Rh
CAS-Nummer:
7440-16-6
Molekulargewicht:
102.91
EG-Nummer:
231-125-0
MDL-Nummer:
MFCD00011201
UNSPSC-Code:
12141738
PubChem Substanz-ID:
24852239
NACRES:
NA.23

Qualitätsniveau

100

Assay

99.95% trace metals basis

Form

powder

Widerstandsfähigkeit

4.33 μΩ-cm, 20°C

bp

3727 °C (lit.)

mp (Schmelzpunkt)

1966 °C (lit.)

Dichte

12.41 g/cm3 (lit.)

SMILES String

[Rh]

InChI

1S/Rh

InChIKey

MHOVAHRLVXNVSD-UHFFFAOYSA-N

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Allgemeine Beschreibung

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.

Anwendung

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.

Lagerklassenschlüssel

4.1B - Flammable solid hazardous materials

WGK

nwg

Flammpunkt (°F)

Not applicable

Flammpunkt (°C)

Not applicable

Persönliche Schutzausrüstung

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

Analysenzertifikate (COA)

Suchen Sie nach Analysenzertifikate (COA), indem Sie die Lot-/Chargennummer des Produkts eingeben. Lot- und Chargennummern sind auf dem Produktetikett hinter den Wörtern ‘Lot’ oder ‘Batch’ (Lot oder Charge) zu finden.

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

Sigma-Aldrich

212857

Rhodium auf Tonerde

Platin powder, 99.995% trace metals basis

Sigma-Aldrich

204013

Platin

Osmium powder, 99.9% trace metals basis

Sigma-Aldrich

263257

Osmium

Rhodium auf Kohle extent of labeling: 5 wt. % loading

Sigma-Aldrich

206164

Rhodium auf Kohle

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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