Sodium monothiophosphate

Sodium monothiophosphate
Names
	IUPAC name Sodium monothiophosphate
Identifiers
CAS Number	10101-88-9 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.030.224
EC Number	233-26-1;
PubChem CID	6913045;
UNII	AN1017219I ;
CompTox Dashboard (EPA)	DTXSID30889527 ;
	InChI InChI=1S/3Na.H3O3PS/c;;;1-4(2,3)5/h;;;(H3,1,2,3,5);
	SMILES OP(=S)(O)O.[Na].[Na].[Na];
Properties
Chemical formula	Na3PO3S
Molar mass	180.030 g/mol
Appearance	Crystalline white solid
Melting point	120 to 125 °C (248 to 257 °F; 393 to 398 K) (decomposition)
Solubility in water	Miscible
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium monothiophosphate, or sodium phosphorothioate, is a chemical compound with the molecular formula Na₃PO₃S. It is a crystalline white solid that decomposes without melting at 120-125 °C.

Preparation

Sodium monothiophosphate is created via the reaction between thiophosphoryl chloride and sodium hydroxide according to the method of Yasuda and Lambert.^[1]

PSCl₃ + 6 NaOH → Na₃PO₃S + 3 NaCl + 3 H₂O

The yield depends on the purity of the sodium hydroxide. Also, sodium phosphorothiolate decomposes at neutral pH and so it was found that using an excess of sodium hydroxide will allow for a greater yield since the reaction will not near a neutral pH. Also, it was noted that silicone grease catalyses the hydrolysis of the phosphorothioate ion, so it is recommended that it is not used in the glass joints.^[2] The reported average yield was 59% and it is possible to get higher if the pH is altered.^[3]

References

^ S. K. Yasuda and J. L. Lambert, Inorganic Syntheses, 5, 102 (1957).
^ Lucian C. Pop and M. Saito (2015). "Serendipitous Reactions Involving a Silicone Grease". Coordination Chemistry Reviews. doi:10.1016/j.ccr.2015.07.005.
^ L. C. Washburn and R. L. Hayes, Inorganic Syntheses, 17, 193

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[1] S. K. Yasuda and J. L. Lambert, Inorganic Syntheses, 5, 102 (1957).

[2] Lucian C. Pop and M. Saito (2015). "Serendipitous Reactions Involving a Silicone Grease". Coordination Chemistry Reviews. doi:10.1016/j.ccr.2015.07.005.

[3] L. C. Washburn and R. L. Hayes, Inorganic Syntheses, 17, 193

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