Dimethyl Sulfoxide (DMSO), chemical name Dimethyl Sulfoxide, is a sulfur-containing organic compound with the molecular formula C₂H₆OS, possessing a variety of important properties. Below is a detailed introduction to DMSO:
Physical Properties
- Appearance: At room temperature, DMSO is a colorless, odorless, transparent liquid, but it is hygroscopic.
- Melting Point: 18.4 °C
- Boiling Point: 189 °C
- Density: 1.100 kg/m³
- Flash Point: 95 °C
- Solubility: DMSO is soluble in water, ethanol, acetone, acetaldehyde, pyridine, ethyl acetate, and many other organic compounds. It is a key non-protic polar solvent and is often referred to as a "universal solvent."
Chemical Properties
- Stability: DMSO is relatively stable at room temperature but can decompose when exposed to high temperatures, sunlight, or oxygen.
- Reactivity: When heated in the presence of acids, it may produce small amounts of methyl mercaptan, formaldehyde, dimethyl sulfide, and methanesulfonic acid. It reacts violently with chlorine and burns with a pale blue flame in air.
- Reducing Properties: DMSO can be reduced to methyl sulfide and, under strong oxidizing conditions, can be oxidized to dimethyl sulfone.
Synthesis Methods
- Organic Solvent DMSO can be synthesized using several methods:
- Methanol–Carbon Disulfide Method: Methanol and carbon disulfide are used as raw materials and oxidized to produce DMSO.
- Hydrogen Peroxide Method: Dimethyl sulfide reacts with hydrogen peroxide in acetone as a buffer to form DMSO.
- Nitrogen Dioxide Method: Dimethyl sulfide is first generated from methanol and hydrogen sulfide, then oxidized with nitrogen dioxide to produce DMSO.
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