Phosphorus sesquisulfide

• Phosphorus sesquisulphide
• Phosphorus (III ) sulphide
• Phosphorus trisulfide

Yellowish odorless solid

Fixed

2.03 g · cm -3

172 ° C.

407 ° C

Risk

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Tetraphosphorus trisulfide is an inorganic chemical compound of the phosphor from the group of sulfides.

Production and representation

Tetraphosphorus trisulfide can be obtained by reaction of phosphorus with sulfur. In excess sulfur also arise Tetraphosphordecasulfid and other phosphorus sulfides.

Properties

Tetraphosphorus trisulfide is a yellowish green odorless solid that is present in the form of long, air- resistant, rhombic needles. It decomposes when heated, with phosphorus oxides and sulfur oxides are formed. In the presence of oxygen self-ignition is possible. In the absence of oxygen and moisture, it is still about 700 ° C resistant. Decomposed by water at higher temperature with evolution of hydrogen sulfide. Soluble in carbon disulfide and benzene. These solutions become turbid almost instantly in the air and can gradually turn a yellowish- white, voluminous precipitate. Tetraphosphorus trisulfide has an orthorhombic crystal structure with space group Pnmb. At 39 ° C, a conversion into a rhombic crystal structure with space group R3 takes place.

Use

Tetraphosphorus trisulfide was used for matches, which ignite on each friction surface.