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101036

1-(2-Pyridylazo)-2-naphthol

indicator grade

Synonym(s):

PAN

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About This Item

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

indicator grade

Quality Segment

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 (lit.), 138-141 °C ((280 - 286 °F) - 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

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.

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.

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Storage Class

11 - Combustible Solids

WGK

WGK 3

Flash Point (°F)

Not applicable

Flash Point (°C)

Not applicable

PPE (personal protective equipment)

dust mask type N95 (US), Eyeshields, Gloves

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