1-Phenyltetrazole-5-thiol

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-thiolSynonyms:5-Mercapto-1-phenyltetrazolePMTCAS Number: 86-93-1Molecular Formula: C₇H₆N₄SMolecular Weight: 178.21 g/molAppearance: White to pale yellow crystalline powderOdor: 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 containersStore in a cool, dry, well-ventilated areaHandling:Use nitrile gloves, safety goggles, and a fume hoodAvoid dust formation

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5. Applications

Photography:Antifogging agent in silver halide emulsionsCorrosion Inhibition:Additive in metal plating bathsOrganic Synthesis:Ligand for transition metal complexesPrecursor for heterocyclic compounds

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