Murexide

Murexide (NH4C8H4N5O6, or C8H5N5O6·NH3), also called ammonium purpurate or MX, is the ammonium salt of purpuric acid. It is a purple solid that is soluble in water. The compound was once used as an indicator reagent. Aqueous solutions are yellow at low pH, reddish-purple in weakly acidic solutions, and blue-purple in alkaline solutions.

Murexide
Names
IUPAC name
Ammonium 2,6-dioxo-5-[(2,4,6-trioxo-5-hexahydropyrimidinylidene)amino]-3H-pyrimidin-4-olate
Other names
Purpuric acid ammonium salt
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.019.334
EC Number
  • 221-266-6
UNII
  • InChI=1S/C8H5N5O6.H3N/c14-3-1(4(15)11-7(18)10-3)9-2-5(16)12-8(19)13-6(2)17;/h(H2,10,11,14,15,18)(H3,12,13,16,17,19);1H3 Y
    Key: LJYRLGOJYKPILZ-UHFFFAOYSA-N Y
  • InChI=1/C8H5N5O6.H3N/c14-3-1(4(15)11-7(18)10-3)9-2-5(16)12-8(19)13-6(2)17;/h(H2,10,11,14,15,18)(H3,12,13,16,17,19);1H3
    Key: LJYRLGOJYKPILZ-UHFFFAOYAL
  • [O-]\C2=C(/N=C1\C(=O)NC(=O)NC1=O)C(=O)NC(=O)N2.[NH4+]
Properties
C8H8N6O6
Molar mass 284.188 g·mol−1
Density 1.72 g/cm3 (hydrate of ammonium salt)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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