Phosphomolybdic acid

Phosphomolybdic acid
Names
	Other names Molybdophosphoric acid; dodecamolybdophosphoric acid
Identifiers
CAS Number	12026-57-2 ; 51429-74-4 (hydrate) ;
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[1] (hydrate)
Melting point	79-90 °C[1]
Solubility in water	soluble
Hazards
Main hazards	Oxidiser[1] (hydrate)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Phosphomolybdic acid, also known as dodeca molybdophosphoric acid or PMA, is a yellow-green chemical compound that freely soluble in water and polar organic solvents such as ethanol. It is used as a stain in histology and in organic synthesis

Histology

Phosphomolybdic acid is a component of Masson's trichrome stain.^[2]

Organic synthesis

Phosphomolybdic is used as a stain for developing thin-layer chromatography plates,^[3] 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.^[4]

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.^[5]

References

1 2 3 "Phosphomolybdic acid hydrate - Safety data sheet" (PDF). www.sigmaaldrich.com. 2016-07-18. Retrieved 2018-10-06.
↑ "Masson's Trichrome for Muscle and Collagen". StainsFile.
↑ "Stains for Developing TLC Plates" (PDF). McMaster University.
↑ Burstein, Shlomo (1953). "Reduction of Phosphomolybdic Acid by Compounds Possessing Conjugated Double Bonds". Analytical Chemistry. 25 (3): 422–424. doi:10.1021/ac60075a012. ISSN 0003-2700 – via ACS Publications.
↑ Chaskar, Atul; Padalkar, Vikas; Phatangare, Kiran; Langi, Bhushan; Shah, Chetan (2010). "Miceller-Mediated Phosphomolybdic Acid: Highly Effective Reusable Catalyst for Synthesis of Quinoline and Its Derivatives". Synthetic Communications. 40 (15): 2336–2340. doi:10.1080/00397910903245141. ISSN 0039-7911 – via Taylor & Francis Online.

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[SA_SDS-1] 1 2 3 "Phosphomolybdic acid hydrate - Safety data sheet" (PDF). www.sigmaaldrich.com. 2016-07-18. Retrieved 2018-10-06.

[2] "Masson's Trichrome for Muscle and Collagen". StainsFile.

[3] "Stains for Developing TLC Plates" (PDF). McMaster University.

[4] Burstein, Shlomo (1953). "Reduction of Phosphomolybdic Acid by Compounds Possessing Conjugated Double Bonds". Analytical Chemistry. 25 (3): 422–424. doi:10.1021/ac60075a012. ISSN 0003-2700 – via ACS Publications.

[5] Chaskar, Atul; Padalkar, Vikas; Phatangare, Kiran; Langi, Bhushan; Shah, Chetan (2010). "Miceller-Mediated Phosphomolybdic Acid: Highly Effective Reusable Catalyst for Synthesis of Quinoline and Its Derivatives". Synthetic Communications. 40 (15): 2336–2340. doi:10.1080/00397910903245141. ISSN 0039-7911 – via Taylor & Francis Online.

Phosphomolybdic acid

Histology

Organic synthesis

See also

References