Aluminon

Chembox new
Name = Aluminon
OtherNames = ammonium aurin-tricarboxylate; 5- [(3-carboxy-4-hydroxyphenyl)(3-carboxy-4-oxo-2,5-cyclohexadien-ylidene)methyl] -2-hydroxybenzoic acid triammonium salt
ImageFile = Aluminon.svg
ImageSize = 200px
Section1 = Chembox Identifiers
CASNo = 569-58-4
PubChem = 68439
Section2 = Chembox Properties
Formula = C₂₂H₂₃N₃O₉
MolarMass = 473.43 g/mol
Appearance = yellow-brown crystals, red in aqueous solution
Solvent = other solvents
SolubleOther = freely soluble in H₂O

Aluminon, the triammonium salt of aurin tricarboxylic acid, is a dye commonly used to detect the presence of the aluminium ion in an aqueous solution. In addition to its use in qualitative inorganic analysis, aluminon has applications in pharyngeal aerosols. It forms brilliantly colored lake pigments with aluminum, chromium, iron, and beryllium.

Aluminon is prepared by reacting sodium nitrite with salicylic acid, adding formaldehyde, then treating with ammonia. [Merck Index 13^th Ed.]

ee also

* Analytical chemistry
* Colorimetry

References