Structure via PubChem · Public domain (PubChem)
2,4-diaminophenol
Sign in to saveAlso known as amidol, 4-hydroxy-1,3-benzenediamine
Amidol is a colorless crystalline compound with the molecular structure C6H3(NH2)2OH. It is a dihydrogen chloride salt and is used as a photographic developer. It was introduced as a developing agent for photographic papers in 1892. It is unusual amongst developing agents as it works most effectively in slightly acid conditions rather than the strongly alkaline conditions required for most other developers. As amidol ages it changes color to a dark red-brown. Developing dishes and equipment used to prepare amidol solutions are also frequently stained brown, a stain that is very persistent.
Chemical data
- Formula
- C6H8N2O
- Molecular weight
- 124.14 g/mol
- IUPAC name
- 2,4-diaminophenol
- SMILES
- C1=CC(=C(C=C1N)N)O
- InChIKey
- XIWMTQIUUWJNRP-UHFFFAOYSA-N
- XLogP
- 0.5
- Polar surface area
- 72.3 Ų
- H-bond donors
- 3
- H-bond acceptors
- 3
- Formal charge
- 0
via PubChem
Drug data · ChEMBL
- Molecule type
- Small molecule
via ChEMBL · EBI
Wikidata facts
- Subclass of
- chemical compound
- Mass
- 124.064
Show 4 more facts
- Commons category
- Amidol
- melting point
- 78
- chemical formula
- C₆H₈N₂O
- canonical SMILES
- C1=CC(=C(C=C1N)N)O
Sources (2)
via Wikidata · CC0
~1 min read
Encyclopedic overview
1 sectionsContents
- References
Amidol is a colorless crystalline compound with the molecular structure C6H3(NH2)2OH. It is a dihydrogen chloride salt and is used as a photographic developer. It was introduced as a developing agent for photographic papers in 1892. It is unusual amongst developing agents as it works most effectively in slightly acid conditions rather than the strongly alkaline conditions required for most other developers. As amidol ages it changes color to a dark red-brown. Developing dishes and equipment used to prepare amidol solutions are also frequently stained brown, a stain that is very persistent.
Prints developed in amidol are typically a very warm brown-black color, but overdevelopment can quickly lead to chemical fogging.
Excerpted from Wikipedia’s “2,4-diaminophenol” article, available under the CC BY-SA 4.0 licence.