Phosphomolybdate

Phosphomolybdic acid

Names
Other names Molybdophosphoric acid; dodecamolybdophosphoric acid
Identifiers
CAS Number	12026-57-2 Y 51429-74-4 (hydrate) N
3D model (JSmol)	Interactive image
ChemSpider	9426978
ECHA InfoCard	100.130.014
EC Number	234-713-5
MeSH	Phosphomolybdic+acid
PubChem CID	11251951
InChI InChI=1S/12Mo.H3O4P.36O/c;;;;;;;;;;;;1-5(2,3)4;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/h;;;;;;;;;;;;(H3,1,2,3,4);;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Key: DHRLEVQXOMLTIM-UHFFFAOYSA-N
SMILES OP(=O)(O)O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O
Properties
Chemical formula	H3PMo12O40
Molar mass	1825.25 g/mol
Density	1.62 g/ml (hydrate)
Melting point	79-90 °C
Solubility in water	soluble
Hazards
Main hazards	Oxidiser (hydrate)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Phosphomolybdic acid, also known as dodeca molybdophosphoric acid or PMA is a component of Masson's trichrome stain. It is a yellow-green compound, freely soluble in water and polar organic solvents such as ethanol. It is used as a reagent in thin layer chromatography for staining phenolics, hydrocarbon waxes, alkaloids and steroids.

Conjugated, unsaturated compounds reduce PMA to molybdenum blue. The color intensifies with increasing number of double bonds in the molecule being stained.

Phosphomolybdic acid is also occasionally used in acid-catalyzed reactions in organic synthesis. It has been shown to be a good catalyst for the Skraup reaction for the synthesis of substituted quinolines.