20816-12-0
Product Name:
Osmium tetroxide
Formula:
O4Os
Synonyms:
‘Osmic acid’;Osmium(VIII)-oxide
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Osmium tetroxide appears as a colorless or yellow solid with a pungent odor of chlorine. Begins to sublime below melting point. Soluble in alcohol. Toxic by inhalation and a strong irritant to the eyes and mucous membranes. |
|---|---|
| Color/Form | Pale yellow solid; monoclinic crystals |
| Odor | Acrid, chlorine-like odor |
| Boiling Point | 266 °F at 760 mmHg (NIOSH, 2023) |
| Melting Point | 105 °F (NIOSH, 2023) |
| Solubility | 6 % at 77 °F (NIOSH, 2023) |
| Density | 5.1 (NIOSH, 2023) - Denser than water; will sink |
| Vapor Density | Relative vapor density (air = 1): 8.8 |
| Vapor Pressure | 7 mmHg (NIOSH, 2023) |
| Stability/Shelf Life | Readily vaporizes from aqueous solution even at room temperature |
| Decomposition | When heated to decomposition, it emits toxic fumes of /osmium/. |
| Ionization Potential | 12.60 eV |
| Odor Threshold | Odor Threshold Low: 0.0019 [mmHg] Odor threshold from NJ "Hazardous Substance Fact Sheet" |
| Other Experimental Properties | Volatility at 25 °C v/v: 12,000 ppm; Safe dilution factor for saturated vapor at 25 °C: 61,000,000 (volatility/threshhold limit value); Odor safety factor: 0.10 threshhold limit value/odor threshhold; Water-air distribution ratio: 580. |
| Chemical Classes | Metals -> Metals, Inorganic Compounds |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Corrosion Corrosives GHS05  Skull and Crossbones Acute Toxicity GHS06 |
| GHS Hazard Statements |
H314:Skin corrosion/irritation |
| Precautionary Statement Codes |
P260:Do not breathe dust/fume/gas/mist/vapours/spray. P270:Do not eat, drink or smoke when using this product. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
COMPUTED DESCRIPTORS
| Molecular Weight | 254.2 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 0 |
| Exact Mass | 255.94114 g/mol |
| Monoisotopic Mass | 255.94114 g/mol |
| Topological Polar Surface Area | 68.3 Ų |
| Heavy Atom Count | 5 |
| Formal Charge | 0 |
| Complexity | 138 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Osmium tetroxide appears as a colorless or yellow solid with a pungent odor of chlorine. Begins to sublime below melting point. Soluble in alcohol. Toxic by inhalation and a strong irritant to the eyes and mucous membranes.