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Aluminon

From Wikipedia, the free encyclopedia
Aluminon
Skeletal formula of aluminon
Space-filling models of the ions in aluminon
Names
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
3D model (JSmol)
ChemSpider
ECHA InfoCard100.008.473Edit this at Wikidata
EC Number
  • 209-319-1
UNII
  • 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);3*1H3 checkY
    Key: AIPNSHNRCQOTRI-UHFFFAOYSA-N checkY
  • 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);3*1H3
    Key: AIPNSHNRCQOTRI-UHFFFAOYAI
  • 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+]
Properties
C22H23N3O9
Molar mass473.43 g/mol
Appearanceyellow-brown crystals, red in aqueous solution
Solubility in other solventsfreely soluble in H2O
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315,H319
P264,P280,P302+P352,P305+P351+P338,P321,P332+P313,P337+P313,P362
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)
Chemical compound

Aluminon, the triammonium salt ofaurintricarboxylic acid, is a dye often used to detect the presence of the aluminium ion in an aqueous solution. Aluminon forms a redcomplex salt in combination with Al3+.[1]

Deep purple pigment in a neutral aqueous solution. Made from aluminon and ferric (Fe3+) ions.

In addition to its use inqualitative inorganic analysis, aluminon has applications in pigment production. It forms brilliantly coloredlake pigments with many metals. The pigments are red in combination withBe2+ andGa3+. The pigment is deep purple or reddish-brown in combination with Fe3+. Color of a particular pigment in acidic solutions may change: aluminon andSc3+ form red pigments if the solution is acidic, but otherwise the solutions are colorless.[1]

Aluminon is prepared by reactingsodium nitrite withsalicylic acid, addingformaldehyde, then treating withammonia.[2]

See also

[edit]

References

[edit]
  1. ^abClark, RA; Krueger, GL (1985)."Aluminon: its limited application as a reagent for the detection of aluminum species".Journal of Histochemistry & Cytochemistry.33 (7):729–732.doi:10.1177/33.7.3891845.ISSN 0022-1554.PMID 3891845.
  2. ^Merck Index, 13th Ed.
Ammonium salts
Inorganic salts
monatomic anions
oxyanions
other anions
Organic salts
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