POTASSIUM OSMATE(VI) DIHYDRATE
Agrochemicals 2025-03-02
Potassium Osmate(VI) Dihydrate
Chemical Name: Potassium hexahydroxoosmate(VI) dihydrate
Synonyms: Potassium osmate dihydrate; Osmium potassium oxide hydrate
CAS Number: 19718-36-6
Molecular Formula: K₂OsO₄·2H₂O
Molecular Weight: 368.43 g/mol
Physical & Chemical Properties
| Property | Specification |
|---|---|
| Appearance | Purple-red crystalline solid |
| Solubility | Soluble in water (forms deep purple solution) |
| Melting Point | Decomposes (>200°C) |
| Density | 3.10 g/cm³ (estimated) |
| Oxidation State | Osmium (+6) |
| Stability | Sensitive to light and reducing agents |
Hazard & Safety Information (GHS)
Danger Symbols:
☠️ Acute Toxicity (Category 3, Osmium compounds)
⚠️ Skin/Eye Irritant (Category 2)
Hazard Codes:
• H301: Toxic if swallowed
• H315: Causes skin irritation
• H317: May cause allergic skin reaction
• H319: Causes serious eye irritation
• H335: May cause respiratory irritation
Precautionary Measures:
• P261: Avoid breathing dust/fume
• P280: Wear protective gloves/eye protection
• P301+P310: IF SWALLOWED: Call poison center
Chemical Behavior
• Reactivity:
- Strong oxidizer (reacts with organic materials)
- Reduces to black osmium(IV) oxide (OsO₂) in acidic conditions
• Catalytic Use: - Syn-dihydroxylation of alkenes (with NMO co-oxidant)
Applications
✔ Organic Synthesis:
- Asymmetric dihydroxylation (Sharpless catalyst precursor)
✔ Electrochemistry: - Redox-active material
✔ Analytical Chemistry: - Staining agent in microscopy
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