Osmium

Base Information

• Chemical Name: Osmium
• CAS No.: 7440-04-2
• Molecular Formula: Os
• Molecular Weight: 190.20
• Hs Code.: 71104100
• European Community (EC) Number: 231-114-0
• UNII: 2E7M255OPY
• DSSTox Substance ID: DTXSID5064679
• Nikkaji Number: J10.494I
• Wikipedia: Osmium
• Wikidata: Q751,Q27104722
• NCI Thesaurus Code: C95182
• Mol file: 7440-04-2.mol

Synonyms:NSC 607770;NSC 607771;NSC 607772;

Chemical Property of Osmium

Chemical Property:

• Appearance/Colour: Black powder
• Melting Point: 3045 °C(lit.)
• Boiling Point: 5027 °C(lit.)
• PSA: 0.00000
• Density: 22.48 g/cm3
• LogP: 0.00000
• Water Solubility.: attacked by aqua regia; barely affected by HCl, H2SO4 [MER06]
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 0
• Rotatable Bond Count: 0
• Exact Mass: 191.96148
• Heavy Atom Count: 1
• Complexity: 0

Purity/Quality:

99%, ^*data from raw suppliers

Osmium ^*data from reagent suppliers

Safty Information:

• Pictogram(s): Highly toxic; irritant to skin.
• Hazard Codes: F,Xi
• Statements: 11-37/38-41-36/38
• Safety Statements: 16-26-36/37/39

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Metals -> Elements, Metallic
• Canonical SMILES: [Os]
• Recent ClinicalTrials: Oxaliplatin and S-1 (OS) Versus Oxaliplatin and Capecitabine (XELOX) for Advanced Colorectal Cancer
• Description: Osmium was discovered by English chemist Smithson Tennant in 1804. The element was named osmium after the Greek word, osme, which means a smell, because of the pungent and peculiar odor of its volatile oxide. Osmium occurs in nature, always associated with other platinum group metals. It usually is found in lesser abundance than other noble metals. Its most important mineral is osmiridium (or iridosmine), a naturally occurring mineral alloyed with iridium. The commercial applications of osmium are limited and considerably fewer than other platinum group metals. Its alloys are very hard and are used to make tips of fountain-pen nibs, phonograph needles, and pivots. The metal also exhibits effective catalytic properties in hydrogenation and other organic reactions. Such catalytic applications, however, are limited and osmium fails to replace other noble metals, particularly palladium and platinum, which are more effective as catalysts and cost less. Osmium is silvery white, hard transition metals with a high melting point. osmium is one of the rarest elements on earth.
• Physical properties: One of the important properties of osmium is the formation of gases when the metal isexposed to air. These fumes are extremely toxic, which limits osmium’s usefulness. Osmium is ahard, tough, brittle, bluish-white metal that is difficult to use except in a powder form that oxidizesinto osmium tetroxide (OsO4), which not only has objectionable odor but also is toxic.Osmium has a relatively high melting point of 3,054°C and a boiling point of 5,500°C,with a density of 22.61 g/cm3.
• Uses: Because of its hard brittle nature, the metal osmium has few uses. However, the powderedform can be sintered under high pressure and temperatures to form some useful products,despite its toxicity and malodor. Its main use is as an alloy to manufacture devices that resistwear and stand up to constant use. As an alloy, osmium loses both its foul odor and toxicity.Some of these products are ballpoint and fountain pen tips, needles for record players, andpivot points for compass needles. Osmium alloys are also used for contact points on specialswitches and other devices that require reduced frictional wear. Another use is as a stain for animal tissues that are to be examined with a microscope toimprove the contrast of the specimen. Osmium, plasma standard solution is used as a standard solution in analytical chemistry and atomic absorption spectroscopy. It is also used as a single-element standard solution for plasma emission spectrometry.