Photo by sciencemadness user len1
| IUPAC names
| Other names
|Molar mass||102.97 g/mol|
|Appearance||Red fuming liquid|
|Density||1.621 g/cm3 (at 20 °C)|
|Melting point||−121.0 °C (−185.8 °F; 152.2 K)|
|Boiling point||59 °C (138 °F; 332 K)|
|Solubility|| Reacts with alcohols|
Soluble in glacial acetic acid, benzene, bromine, CCl4, chloroethane, cyclohexane, disulfur dichloride, hexane, phosgene
Insoluble in liq. SO2
|Vapor pressure||162 mmHg (at 20 °C)|
Std enthalpy of
|Safety data sheet||CPCB|
|Flash point||118 °C|
| Disulfur dichloride|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Sulfur dichloride slowly evolves chlorine, leaving disulfur dichloride unless the container can maintain a small positive pressure of chlorine.
Sulfur chlorides can be used to produce thionyl chloride.
SCl2 has a highly unpleasant odor, as well as producing HCl and SO2 which are also highly unpleasant to breathe in.
It is a bright red liquid with viscosity similar to water.
Due to air instability and pressure build-up from decomposition to the monochloride, sulfur dichloride is generally not sold to individuals, and has to be made in situ.
SCl2 distills over as chlorine is passed over molten sulfur. This reaction may also produce disulfur dichloride.
Both sulfur and chlorine are common chemicals in a home laboratory but the synthesis of sulfur dichloride is complicated as it requires simultaneous distillation while gassing the sulfur with the chlorine which requires moderately complicated glassware such as two necked flasks or a very well improvised setup.
Sulfur dichloride is extremely toxic and corrosive and proper protection must be worn when working with the compound. Work should be performed in a fumehood.
SCl2 should be stored in a sealed container, in a dry cold place. As it slowly decomposes over time, it's best to open the bottle from time to time to release the pressure.
Reaction with water destroys the compound, and this can be effective if done outside or in an area capable of safely removing the sulfur dioxide. Aqueous sodium hydroxide solutions can also be used. Calcium hydroxide suspension is also a good choice. Be careful to only add the compound dropwise in a large amount of neutralizing solution.
- Ruff, O.; Ber. Deutsch. Chem. Ges.; vol. 34; (1901); p. 1749 - 1758