Phosphorus sesquisulfide
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| Molar mass | 220.093 g/mol |
| Appearance | Yellow, yellow-green or gray solid |
| Density | 2.08 g.cm3,[1] solid |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Template:Longitem | orthorhombic, Schönflies notation D2h |
| Template:Longitem | Pmnb |
| Template:Longitem | [[Phosphorus pentasulfide|Template:Chem2]] [[Phosphorus trioxide|Template:Chem2]] |
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Phosphorus sesquisulfide is the inorganic compound with the formula Template:Chem2. It was developed by Henri Sevene and Emile David Cahen in 1898 as part of their invention of friction matches that did not pose the health hazards of white phosphorus.[2][3] This yellow solid is one of two commercially produced phosphorus sulfides. It is a component of "strike anywhere" matches.
Depending on purity, samples can appear yellow-green to grey. The compound was discovered by G. Lemoine and first produced safely in commercial quantities in 1898 by Albright and Wilson. It dissolves in an equal weight of carbon disulfide (Template:Chem2), and in a 1:50 weight ratio of benzene. Unlike some other phosphorus sulfides, Template:Chem2 is slow to hydrolyze and has a well-defined melting point.
Structure and synthesis
The molecule has C3v symmetry. It is a derivative of the tetrahedral (Template:Chem2) unit from insertion of sulfur into three P-P bonds. The P-S and P-P distances are 2.090 and 2.235 Å, respectively. [[phosphorus selenide|Template:Chem2]] and Template:Chem2 adopt the same structures.[1] These compounds can be melted together and form mixed crystals of one dissolved in the other.[4] Under higher temperatures, mixed chalcogenide molecules Template:Chem2 and Template:Chem2 will form.[5]
Template:Chem2 is produced by the reaction of red or white phosphorus with sulfur. Excess sulfur gives phosphorus pentasulfide (Template:Chem2). It is estimated that 150 ton/y were produced in 1989.[6]
Applications
Template:Chem2 and potassium chlorate, together with other materials, composes the heads of "strike-anywhere matches".[7]
Safety
Its flash point is about 100 °C.[8]
Health effects
Exposure to "strike anywhere" matches containing phosphorus sesquisulfide can cause contact dermatitis, usually in the pocket area but also on the face.[9] Exposure over a long period of time to burning match tips (containing phosphorus sesquisulfide) can result in a recurring severe primary dermatitis about the eyes and face. Loosening of the teeth has also been reported which may have been due to phosphorus poisoning.[10]
References
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- ↑ a b Script error: No such module "Citation/CS1".
- ↑ <templatestyles src="Citation/styles.css"/>Template:Citation/make link, Seyene, H.; Cahen, E. D., "Match Composition", issued Script error: No such module "auto date formatter".Script error: No such module "Check for unknown parameters".
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This article contains public domain text from the NOAA as cited.
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