Agrochemicals

1-Phenyl-1H-tetrazole-5-thiol (CAS No. 86-93-1) 

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1. Basic Information

• IUPAC Name: 1-Phenyl-1H-tetrazole-5-thiol
• Synonyms:
  • 5-Mercapto-1-phenyltetrazole
  • PMT
• CAS Number: 86-93-1
• Molecular Formula: C₇H₆N₄S
• Molecular Weight: 178.21 g/mol
• Appearance: White to pale yellow crystalline powder
• Odor: Slight sulfurous odor

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2. Physical and Chemical Properties

Property	Value
Melting Point	210–215°C (dec.)
Solubility	– Water: Insoluble
	– Organic solvents: Soluble in DMF, DMSO, alkaline solutions
pKa	~6.5 (thiol group)
Log Pow	1.8 (octanol/water)

 

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3. Hazards (GHS Classification)

• Health Hazards:
  • Harmful if swallowed (H302)
  • Causes skin irritation (H315)
  • Causes serious eye irritation (H319)
• Environmental: Toxic to aquatic life (H411)
• NFPA Rating: Health 2, Flammability 1, Reactivity 1

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4. Storage and Handling

• Storage:
  • Keep in tightly sealed amber containers
  • Store in a cool, dry, well-ventilated area
• Handling:
  • Use nitrile gloves, safety goggles, and a fume hood
  • Avoid dust formation

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5. Applications

• Photography:
  • Antifogging agent in silver halide emulsions
• Corrosion Inhibition:
  • Additive in metal plating baths
• Organic Synthesis:
  • Ligand for transition metal complexes
  • Precursor for heterocyclic compounds

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