Molekula
4-Nitro-o-phenylenediamine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
4-Nitro-o-phenylenediamine is an aromatic diamine compound primarily used as an intermediate in the synthesis of dyes, pigments, and pharmaceuticals, particularly for azo dye production and hair coloring formulations. It is also used in analytical chemistry as a chelating agent for gas chromatographic selenium determination and as a colorimetric reagent for ascorbic acid and alpha-keto acids. It appears as an off-white to yellowish crystalline powder with a melting point around 180–185°C. This chemical has a CAS number of 99-56-9, molecular formula C6H7N3O2, and a molecular weight of 153.14 g/mol. Store it at ambient temperatures in a cool, dry place, away from incompatible substances. The signal word is Warning, indicating moderate hazard. Molekula supplies 4-Nitro-o-phenylenediamine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
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100 g — £73.20 per pack ex VAT · £87.84 inc. VAT
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Specifications
| Property | Value |
|---|---|
| Appearance | Red powder |
| Melting Point | 198-205°C |
| Purity (HPLC) | 97-100% |
| 2,4-Dinitroaniline | ≤1% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 199.5 °C |
| Solubility (other solvents) | Soluble in acid |
| Vapour Pressure | 0.000109 mmHg |
| pKa | pKa = 2.61 |
| log P (octanol/water) | 0.88 |
Source: PubChem CID 5111791 (HSDB, Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 42675126 |
| CAS Number | 99-56-9 |
| IUPAC Name | 4-nitrobenzene-1,2-diamine |
| EC Number | 202-766-3 |
| Molecular Formula | C6H7N3O2 |
| Molecular Weight | 153.14 |
| Exact Mass | 153.0538 |
| SMILES | C1=CC(=C(C=C1[N+](=O)[O-])N)N |
| InChIKey | RAUWPNXIALNKQM-UHFFFAOYSA-N |
| InChI | InChI=1S/C6H7N3O2/c7-5-2-1-4(9(10)11)3-6(5)8/h1-3H,7-8H2 |
| PubChem CID | 5111791 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29215130 |
| Tariff Code | 2921511990 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
- H317 May cause an allergic skin reaction
Precautionary statements
- P235+410 Keep cool. Protect from sunlight
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+350 IF ON SKIN: Gently wash with soap and water
- P309+311 IF exposed or you feel unwell: Call a POISON CENTER or doctor/physician
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1,2-Benzenediamine, 4-nitro-
- 1,2-Diamino-4-nitrobenzene
- 2-Amino-4-nitroaniline
- 3,4-Diaminonitrobenzene
- 4-Nitro-1,2-benzenediamine
- 4-Nitro-1,2-diaminobenzene
- 4-Nitro-1,2-phenylenediamine
- 4-Nop
- 4-Nopd
- p-Nitro-o-phenylenediamine
Frequently asked questions
What is 4-Nitro-o-phenylenediamine (CAS 99-56-9) commonly used for?
It is primarily used as a hair dye intermediate in the synthesis of black and dark brown hair colorants, as well as a building block in benzimidazole synthesis and in organic synthesis for specialty chemicals.
What is the molecular formula and molecular weight of this compound?
The molecular formula is C₆H₇N₃O₂, and the molecular weight is 153.14 g/mol.
How should 4-Nitro-o-phenylenediamine be stored?
Store in a cool, dry place at ambient temperature, away from direct sunlight and incompatible materials like strong oxidizers. Keep containers tightly sealed.
What grades or purities are available for this product?
Molekula supplies this compound in technical grade (97%+ purity) and analytical/ACS grade upon request—confirm availability for bulk orders.
Can Molekula supply this in bulk quantities?
Yes, we offer bulk packaging options (e.g., 5kg, 25kg drums, or custom quantities) for industrial and commercial applications—contact us for pricing and lead times.
What documentation is provided with an order of 4-Nitro-o-phenylenediamine?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS/SDS), and batch-specific documentation for traceability. Custom certificates (e.g., REACH, FDA compliance) are available upon request.
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