Related compounds Molar mass 444.555 g/mol Boiling point 514 °C | Formula P4S10 Density 2.09 g/cm³ Melting point 288 °C | |
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Appearance greenish-gray to yellow solid | ||
Phosphorus pentasulfide is the inorganic compound with the formula P2S5 or dimer P4S10. This yellow solid is the one of two phosphorus sulfides of commercial value. Samples often appear greenish-gray due to impurities. It is soluble in carbon disulfide but reacts with many other solvents such as alcohols, DMSO, and DMF.
Contents
Structure and synthesis
Its tetrahedral molecular structure is similar to that of adamantane and almost identical to the structure of phosphorus pentoxide.
Phosphorus pentasulfide is obtained by the reaction of liquid white phosphorus (P4) with sulfur above 300 °C. The first synthesis of P4S10 by Berzelius in 1843 was by this method. Alternatively, P4S10 can be formed by reacting elemental sulfur or pyrite, FeS2, with ferrophosphorus, a crude form of Fe2P (a byproduct of P4 production from phosphate rock):
4 Fe2P + 18 S → P4S10 + 8 FeS 4 Fe2P + 18 FeS2 + heat → P4S10 + 26 FeSApplications
Approximately 150,000 tons of P4S10 are produced annually. The compound is mainly converted to other derivatives for use as lubrication additives such zinc dithiophosphates. It is also used in the production of pesticides such as Parathion and Malathion. It is also a component of some amorphous solid electrolytes (e.g. Li2S-P2S5) for some types of lithium batteries.
Phosphorus pentasulfide is a dual-use material, for the production of early insecticides such as Amiton and also for the manufacture of the related VX nerve agents.
Reactivity
Due to hydrolysis by atmospheric moisture, P4S10 evolves H2S, thus P4S10 is associated with a rotten egg odour. Aside from H2S, hydrolysis of P4S10 eventually gives phosphoric acid:
P4S10 + 16 H2O → 4 H3PO4 + 10 H2SOther mild nucleophiles react with P4S10, including alcohols and amines. Aromatic compounds such as anisole, ferrocene and 1-methoxynaphthalene react to form 1,3,2,4-dithiadiphosphetane 2,4-disulfides such as Lawesson's reagent.
In organic chemistry P4S10 is used as a thionation reagent. Reactions of this type require refluxing solvents such as benzene, dioxane, or acetonitrile with P4S10 dissociating into P2S5. P2S5 can be trapped for example as the pyridine complex.
Ketones are converted to thioketones. In esters, imides and lactones the oxygen atom can also be replaced by sulfur. With amides the reaction product is a thioamide. With 1,4-diketones the reagent forms thiophenes. Compared to the better known Lawesson's reagent P4S10 suffers from reduced yields.
It is also used to deoxygenate sulfoxides.