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HomeProduct name list1-(2-Pyridylazo)-2-naphthol

1-(2-Pyridylazo)-2-naphthol

Synonym(s):1-(2-Pyridylazo)-2-naphthol (PAN);PAN

  • CAS NO.:85-85-8
  • Empirical Formula: C15H11N3O
  • Molecular Weight: 249.27
  • MDL number: MFCD00004071
  • EINECS: 201-637-9
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-12-18 14:07:02
1-(2-Pyridylazo)-2-naphthol Structural

What is 1-(2-Pyridylazo)-2-naphthol?

Chemical properties

orange crystals

The Uses of 1-(2-Pyridylazo)-2-naphthol

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.

What are the applications of Application

1-(2-Pyridylazo)-2-naphthol is an indicator of transition metals

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.]

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

Melting point: 138-141 °C (lit.)
Boiling point: 392.37°C (rough estimate)
Density  1.1469 (rough estimate)
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
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 for 1-(2-Pyridylazo)-2-naphthol

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405:Store locked up.

Computed Descriptors for 1-(2-Pyridylazo)-2-naphthol

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