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Phosphorus pentasulfide is the chemical compound with the formula P4S10. This yellow solid is an industrially important inorganic compound of phosphorus and sulfur. Commercial samples often appear greenish-gray. The compound has a low solubilty in carbon disulfide and benzene, but it reacts with many organic compounds such as alcohols and amines. Its molecular structure is related to that of adamantane, a common motif in inorganic chemistry, and is almost identical to the structure of phosphorus pentoxide.
Additional recommended knowledge
Phosphorus pentasulfide is obtained by the reaction of liquid white phosphorus, P4, with sulfur above 300 °C. Alternatively, P4S10 can be formed by reacting elemental sulfur or pyrite, FeS2, with ferrophosphorus, impure Fe2P (a byproduct of P4 production from phosphate rock):
Other mild nucleophiles react with P4S10, including alcohols and amines. Aromatic compounds such as anisole, ferrocene and 1-methoxynapthalene react to form 1,3,2,4-dithiadiphosphetane 2,4-disulfides such as lawesson's reagent.
Related phosphorus sulfides
Aside from the commercially important P4S3 and P4S10, several other phosphorus sulfides are known with the formula P4Sx where x is less than or equal to 10. Six of these phosphorus sulfides exist as isomers: P4S4, P4S5, P4S6, P4S7, P4S8, and P4S9. These isomers are distinguished by Greek letter prefixes. The prefix is based on the order of the discovery of the isomers, not on structural principles. All known molecular phosphorus sulfides contain a tetrahedral array of four phosphorus atoms.
The main method for preparing these compounds is thermolysis of mixtures of phosphorus and sulfur. The product distributions can be analyzed by 31P NMR spectroscopy. More selective syntheses entail (i) desulfurization, e.g. using triphenylphosphine and, complementarily, (ii) sulfidation using triphenylarsine sulfide.
Phosphorus pentasulfide is used for manufacturing zinc dialkyl dithio phosphate, insecticides, ore flotation agents, and various organophosphates. It is also a component of some amorphous solid electrolytes (eg. Li2S-P2S5) for some types of lithium batteries.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phosphorus_pentasulfide". A list of authors is available in Wikipedia.|