44565

Tropaeolin O sodium salt

indicator

• Synonym(s): 4-([2,4-Dihydroxyphenyl]azo)benzenesulfonic acid sodium salt, Acid Orange 6, Chrysoin, Resorcinol yellow
• Empirical Formula (Hill Notation): C₁₂H₉N₂O₅SNa
• CAS Number: 547-57-9
• Molecular Weight: 316.27
• Colour Index Number: 14270
• Beilstein: 4173410
• MDL number: MFCD00007499
• UNSPSC Code: 41116105
• NACRES: NA.21

Properties

• grade: indicator
• composition: sulfated ash, 40-60%
• technique(s): UV/Vis spectroscopy: suitable; titration: suitable
• loss: ≤13.0% loss on drying
• pH: 11-13
• λmax: 488-492 nm in 0.1 M NaOH; ≥500 at 1% in 0.1 M NaOH (1 cm)
• SMILES string: [Na+].Oc1ccc(\N=N\c2ccc(cc2)S([O-])(=O)=O)c(O)c1
• InChI: 1S/C12H10N2O5S.Na/c15-9-3-6-11(12(16)7-9)14-13-8-1-4-10(5-2-8)20(17,18)19;/h1-7,15-16H,(H,17,18,19);/q;+1/p-1/b14-13+;
• InChI key: COEZWFYORILMOM-IERUDJENSA-M

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable