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1. Basic Identification Information
| Parameter | English Specification/Value |
|---|---|
| IUPAC Name | bis(4-(methylamino)phenol); sulfuric acid (also: 4-(Methylamino)phenol sulfate (2:1) salt) |
| Common Name(s) | p-Methylaminophenol Sulfate; Metol; N-methyl-p-aminophenol sulfate; Bis(4-hydroxy-N-methylanilinium) sulfate; 4-Methylaminophenol hemisulfate |
| CAS Registry Number | 55-55-0 |
| EC/EINECS Number | 200-232-0 |
| Molecular Formula | (C₇H₁₀NO)₂·H₂SO₄ (or C₁₄H₂₀N₂O₆S) |
| Molecular Weight | 344.38 g/mol |
| Chemical Class | Aminophenol sulfate salt; oxidative hair dye coupler; photographic developing agent; reducing agent |
| Related Compound | 4-Aminophenol (CAS 123-30-8) (parent compound without methyl substitution; higher toxicity and sensitization risk) |
2. Physicochemical Properties
| Property Category | Specific Parameter | Specification/Value |
|---|---|---|
| Structural Features | Functional Groups | Two molecules of 4-(methylamino)phenol (each with -OH at C1 and -NHCH₃ at C4) protonated and bound to one sulfate ion (SO₄²⁻); para-substitution enables stable hydrogen bonding and dye coupling |
| Physical Appearance | State & Color | White to off-white crystalline powder; turns pale pink/brown on prolonged air exposure (slow oxidation); faint phenolic/methylamine odor |
| Melting Point | 240–245 °C (decomposes; lit.) | |
| Boiling Point | Decomposes before boiling (releases SO₃ and methylaminophenol vapors above 280 °C) | |
| Density (25 °C) | 1.43 g/cm³ (crystalline form) |
