101036

1-(2-Pyridylazo)-2-naphthol

indicator grade

• Synonym(s): PAN
• Empirical Formula (Hill Notation): C₁₅H₁₁N₃O
• CAS Number: 85-85-8
• Molecular Weight: 249.27
• Beilstein/REAXYS Number: 206390
• EC Number: 201-637-9
• MDL number: MFCD00004071
• UNSPSC Code: 12171500
• PubChem Substance ID: 24846530
• NACRES: NA.47

Properties

• grade: indicator grade
• Quality Level: 200
• form: solid
• technique(s): titration: suitable
• color: green to red, upon chelation with metal; orange-red, as an amorphous solid; yellow, when dissolved in organic solvent
• mp: 138-141 °C ((280 - 286 °F) - lit); 138-141 °C (lit.)
• ε (extinction coefficient): ≥15000 at 462-468 nm in methanol at 0.01 g/L; >35,000 at 222-228 nm in methanol at 0.01 g/L; >9,000 at 300-306 nm in methanol at 0.01 g/L
• suitability: suitable for (Suitable For Use as an Indicator in EDTA Titrations)
• SMILES string: Oc1ccc2ccccc2c1\N=N\c3ccccn3
• InChI: 1S/C15H11N3O/c19-13-9-8-11-5-1-2-6-12(11)15(13)18-17-14-7-3-4-10-16-14/h1-10,19H/b18-17+
• InChI key: LLYOXZQVOKALCD-ISLYRVAYSA-N

Description

General description

1-(2-Pyridylazo)-2-naphthol (PAN) is an orange-colored dye. It can form chelates with metal ions, which makes it a valuable indicator in complexometric titrations.[1][2]

Application

1-(2-Pyridylazo)-2-naphthol is commonly used as an acid-base indicator. It is also suitable as a spectrophotometric reagent, which can extract metal chelates into an organic solvent.

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: dust mask type N95 (US), Eyeshields, Gloves