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Metol
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Description
Metol
Other Names: 4-(Methylamino)phenol sulfate, N-methyl-p-aminophenol sulfate, Pictol, p-(Methylamino)phenol sulfate, Monomethyl-p-aminophenol hemisulfate, Elon, Rhodol, Enel, Viterol, Scalol, Genol, Satrapol, Photol
CAS Number: 55-55-0
Sum Formula: (C₇H₁₀NO)₂SO₄
Molar Mass: 344.38 g/mol
Appearance: White to slightly gray crystalline powder
Metol is the hemisulfate salt of 4-(methylamino)phenol. It is a well-known photographic developing agent used for the reduction of silver halides to metallic silver. Beyond photography, it finds use in chemical synthesis, redox studies, and analytical chemistry as a mild reducing agent.
Chemical and Physical Properties
Density: ~1.4 g/cm³ (estimated)
Melting Point: 165–170°C (decomposes)
Boiling Point: Not applicable (decomposes)
Solubility in Water: Freely soluble
Solubility in Other Solvents: Slightly soluble in alcohol; practically insoluble in ether and chloroform
Odor: Slight amine-like odor
Applications
Photographic Industry: Used as a primary developing agent in black and white photographic developers.
Organic Synthesis: Applied as a reducing agent in the preparation of aromatic amines and related compounds.
Analytical Chemistry: Employed in colorimetric assays and redox studies involving silver and other transition metals.
Material Science: Investigated for use in surface coatings and conductive ink formulations requiring fine control of reduction processes.
Electrochemistry: Studied as a component of redox systems in electrode modification and testing.
Safety
Signal Word: Danger
H302 (99.6%): Harmful if swallowed [Warning Acute toxicity, oral]
H317 (100%): May cause an allergic skin reaction [Warning Sensitization, Skin]
H319 (13.8%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H373 (99.6%): May causes damage to organs through prolonged or repeated exposure [Warning Specific target organ toxicity, repeated exposure]
H400 (99.3%): Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
H410 (100%): Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]
P260, P261, P264, P264+P265, P270, P272, P273, P280, P301+P317, P302+P352, P305+P351+P338, P319, P321, P330, P333+P317, P337+P317, P362+P364, P391, and P501
Handling and Storage
Storage Conditions: Store in a tightly sealed container in a cool, dry, and well-ventilated place. Protect from light, moisture, and oxidizing agents.
Handling Precautions: Avoid dust formation and direct contact with skin and eyes. Handle with appropriate PPE and follow good laboratory practices.