1-Naphthylamine

Chemical Name: 1-Naphthylamine; α-Naphthylamine
Synonyms: 1-Aminonaphthalene; alpha-Naphthylamine
CAS Number: 134-32-7
Molecular Formula: C₁₀H₉N
Molecular Weight: 143.19 g/mol

Physical and Chemical Properties

• Appearance: White to reddish crystalline solid (turns purple/black on air exposure)
• Odor: Slight aromatic amine odor
• Melting Point: 50 °C (122 °F)
• Boiling Point: 300 °C (572 °F)
• Density: 1.13 g/cm³ (at 20 °C)
• Vapor Pressure: 0.001 mmHg (at 25 °C)
• Solubility:
  • Slightly soluble in water (0.17 g/L at 20 °C).
  • Soluble in ethanol, ether, benzene.

Chemical Properties

• Reactivity:
  • Forms salts with acids (e.g., hydrochloride).
  • Oxidizes in air (darkens over time).
  • Reacts with nitrous acid to form carcinogenic diazonium compounds.
• Stability: Light-sensitive; store under inert atmosphere.

Hazard and Safety Information (GHS)

• Hazard Symbols: H351 (Suspected carcinogen), H410 (Very toxic to aquatic life)
• Hazard Statements:
  • H302: Harmful if swallowed.
  • H351: Suspected of causing cancer (Group 2B, IARC).
  • H410: Very toxic to aquatic life with long-lasting effects.
• Precautionary Measures:
  • P201: Obtain special instructions before use.
  • P281: Use personal protective equipment.
  • P308+P313: IF exposed or concerned: Get medical advice.

Storage & Handling

• Store in amber glass bottles under nitrogen/argon to prevent oxidation.
• Keep away from light, heat, and oxidizing agents.
• Use gloves (nitrile), lab coat, and fume hood (potential carcinogen).

Applications

• Dye intermediate (azo dyes, pigments).
• Rubber antioxidant production.
• Research chemical (historically used in pesticide synthesis).

Disclaimer:

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