Aluminon

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Aluminon

Other names ammonium aurin-tricarboxylate; 5-[(3-carboxy-4-hydroxyphenyl)(3-carboxy-4-oxo-2,5-cyclohexadien-ylidene)methyl]-2-hydroxybenzoic acid triammonium salt
Identifiers
CAS number	569-58-4
PubChem	2734958
ChemSpider	2016698^Y
Jmol-3D images	Image 1
SMILES O=C([O-])\C1=C\C(\C=C/C1=O)=C(\c2ccc(O)c(C([O-])=O)c2)c3ccc(O)c(C([O-])=O)c3.[NH4+].[NH4+].[NH4+]
InChI InChI=1S/C22H14O9.3H3N/c23-16-4-1-10(7-13(16)20(26)27)19(11-2-5-17(24)14(8-11)21(28)29)12-3-6-18(25)15(9-12)22(30)31;;;/h1-9,23-24H,(H,26,27)(H,28,29)(H,30,31);31H3^Y Key: AIPNSHNRCQOTRI-UHFFFAOYSA-N^Y InChI=1/C22H14O9.3H3N/c23-16-4-1-10(7-13(16)20(26)27)19(11-2-5-17(24)14(8-11)21(28)29)12-3-6-18(25)15(9-12)22(30)31;;;/h1-9,23-24H,(H,26,27)(H,28,29)(H,30,31);31H3 Key: AIPNSHNRCQOTRI-UHFFFAOYAI
Properties
Molecular formula	C₂₂H₂₃N₃O₉
Molar mass	473.43 g/mol
Appearance	yellow-brown crystals, red in aqueous solution
Solubility in other solvents	freely soluble in H₂O
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Aluminon, the triammonium salt of aurintricarboxylic 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.^[1]

References

^ Merck Index, 13th Ed.

v t e Salicylates

Salicylic acid Aspirin Aloxiprin Methyl salicylate Magnesium salicylate Ethyl salicylate Bismuth subsalicylate Sodium salicylate Salicylamide Salicin Benorilate Salsalate Ethenzamide Diflunisal Trolamine salicylate Homosalate Salicylmethylecgonine Octyl salicylate Aluminon Benzyl salicylate Copper aspirinate Potassium salicylate

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What is the molar mass of aluminonA solution of 3.00 g of aluminon in 60.0 g of water freezes at -0.197C.?

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