1-(2-Pyridylazo)-2-naphthol Chemical Properties

Melting point:

138-141 °C (lit.)

Boiling point:

392.37°C (rough estimate)

Density 

1.1469 (rough estimate)

bulk density

190kg/m3

refractive index 

1.5700 (estimate)

storage temp. 

Store at +5°C to +30°C.

pka

8.86±0.50(Predicted)

form 

Powder/Solid

color 

green to red, upon chelation with metal

Water Solubility 

Insoluble

λmax

461-465 nm in ethanol

ε(extinction coefficient)

≥15000 at 462-468nm in methanol at 0.01g/L
>35,000 at 222-228nm in methanol at 0.01g/L
>9,000 at 300-306nm in methanol at 0.01g/L

BRN 

206390

Stability:

Stable. Incompatible with strong oxidizing agents, strong bases.

CAS DataBase Reference

85-85-8(CAS DataBase Reference)

NIST Chemistry Reference

2-Naphthalenol, 1-(2-pyridinylazo)-(85-85-8)

EPA Substance Registry System

2-Naphthalenol, 1-(2-pyridinylazo)- (85-85-8)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36-37/39

WGK Germany 

3

TSCA 

Yes

HS Code 

29333999

MSDS

• Language:English Provider:1-(2-Pyridylazo)-2-naphthol
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1-(2-Pyridylazo)-2-naphthol Usage And Synthesis

Uses

1-(2-Pyridylazo)-2-naphthol is an indicator of transition metals. 1-(2-Pyridylazo)-2-naphthol is an indicator in complexometry and a reagent for the extraction and spectrophotometric determination of many transition metals. Dyes and metabolites.

Chemical Properties

orange crystals

Uses

1-(2-Pyridylazo)-2-naphthol is an indicator of transition metals. 1-(2-Pyridylazo)-2-naphthol is an indicator in complexometry and a reagent for the extraction and spectrophotometric determination of many transition metals. Dyes and metabolites.

Definition

ChEBI: 1-(2-pyridin-2-yldiazenyl)-2-naphthol is a member of naphthols.

General Description

1-(2-Pyridylazo)-2-naphthol (PAN), an orange colored dye, is commonly used as an acid-base indicator. It can form chelates with metal ions, which makes it a valuable indicator in complexometric titrations. PAN is also a spectrophotometric reagent, which can extract metal chelates into an organic solvent.

Agricultural Uses

1-(2-Pyridylazo)-2-naphthol is a hard stratum of strongly compacted soil caused by continual plowing to the same depth of hardened soil which has high clay content. The precipitated iron and silicates cement the soil particles and form pans. 1-(2-Pyridylazo)-2-naphthol often impede drainage and root growth. It can be broken up using a subsoiler .

Purification Methods

Purify PAN by repeated crystallisation from EtOH or MeOH. It can also be purified by sublimation under vacuum. Purity can be checked by TLC using a mixed solvent (pet ether/Et2O/EtOH; 10:10:1) on a silica gel plate. It has pK1 1.9 and pK2 12.2 in 20% aqueous ethoxyethanol. It chelates with copper [Pease & Williams Anal Chem 31 1046 1959]. [Beilstein 22 I 694, 22 III/IV 7073, 22/4 V 618.]

1-(2-Pyridylazo)-2-naphthol(85-85-8)Related Product Information

• 2-Hydroxypyridine
• Terbinafine Hydrochloride
• Sodium acetate
• 2,6-Lutidine
• 1,1'-Bi-2-naphthol
• 1-Naphthol
• 2-Naphthol
• Phenmedipham
• 2-(2-PYRIDYLAZO)-1-NAPHTHOL,2-(2-pyridylazo)-1-naphthol95+%
• 1-(3-pyridylazo)-2-naphthol
• ANTI-PIG TISSUE (PAN)
• ANTI-PAN-VERTEBRATE CONSERVED (HUMAN),MOUSE ANTI-MAMMAL CYTOKERATIN PAN
• MONOCLONAL ANTI-CYTOKERATIN, PAN,MONOCLONAL ANTI-PAN CYTOKERATIN
• ANTI-PAN SODIUM CHANNEL,ANTI-SODIUM CHANNEL (PAN) (SP19),ANTI-SODIUM CHANNEL (PAN),ANTI-SODIUM CHANNEL, VOLTAGE GATED, PAN [SP19],ANTI-SP19 PAN SODIUM CHANNEL
• ANTI-TGF-BETA PAN-SPECIFIC
• 1-(2-Pyridylazo)-2-naphthol
• BIOTINYLATED ANTI-MOUSE PAN-NK CELLS
• 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid