204218
Rhodium
powder, 99.95% trace metals basis
Přihlásitk zobrazení cen stanovených pro organizaci a smluvních cen
About This Item
Empirický vzorec (Hillův zápis):
Rh
Číslo CAS:
Molekulová hmotnost:
102.91
EC Number:
MDL number:
UNSPSC Code:
12141738
PubChem Substance ID:
NACRES:
NA.23
Doporučené produkty
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.
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
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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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