1-Naphthylamine-7-sulfonic acid
Synonym(s):1-Naphthylamine-7-sulfonic acid;Cleves acid-1,7
- CAS NO.：119-28-8
- Empirical Formula: C10H9NO3S
- Molecular Weight: 223.25
- MDL number: MFCD00004032
- EINECS: 204-311-4
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:12:42
What is 1-Naphthylamine-7-sulfonic acid?
Chemical properties
Brown crystalline. 1-Aminonaphthalene-7-sulfonic acid [119- 28-8]. (8-aminonaphthalene-2-sulfonic acid), 1,7-Cleve’s acid, C10H9NO3S, Mr 223.24, is 0.5 % soluble in water at 25℃ and 3 % soluble at 100 ℃. The sodium, potassium, calcium, and magnesium salts are readily soluble in water but the barium salt is only sparingly soluble. Sulfonation with oleum at 50℃ gives 1- aminonaphthalene-4,7-disulfonic acid. Alkali fusion gives 8-amino-2-naphthol, and Bucherer-type hydrolysis gives 1-hydroxynaphthalene-7-sulfonic acid.
The Uses of 1-Naphthylamine-7-sulfonic acid
Intermediate of dyestuff
The Uses of 1-Naphthylamine-7-sulfonic acid
8-Amino-2-naphthalenesulfonic acid can be used as a reactant to synthesize:
- Fe3O4/sulfonated polyaniline composite material via chemical oxidative polymerization with aniline in the presence of magnetite (Fe3O4) nanoparticles.
- Prismatic crystals of strychnine-8-ammonio-2-naphthalenesulfonate-water by heating with strychnine in water/ethanol solvent mixture.
- 5-amino-9-dialkylamino benzo[a]phenoxazine dyes (Nile blue analogs) by condensation with N-alkyl or N-sulfo-propyl 4-arylazo-substituted 3-hydroxyaniline.
What are the applications of Application
1-Naphthylamine-7-sulfonic acid can be used as a dye intermediate to prepare dyes such as direct light fast blue B2RL, direct light fast red brown RTL, and sulfur blue CV.
Properties of 1-Naphthylamine-7-sulfonic acid
| Melting point: | ≥300 °C(lit.) |
| Boiling point: | 220°C (rough estimate) |
| Density | 1.3588 (rough estimate) |
| refractive index | 1.6500 (estimate) |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | Aqueous Base (Slightly), DMSO (Slightly, Sonicated) |
| pka | pK1: 3.66 (25°C) |
| form | Powder |
| Merck | 14,2351 |
| BRN | 2115629 |
| CAS DataBase Reference | 119-28-8(CAS DataBase Reference) |
| NIST Chemistry Reference | 1-Naphthylamine-7-sulfonic acid(119-28-8) |
| EPA Substance Registry System | 2-Naphthalenesulfonic acid, 8-amino- (119-28-8) |
Safety information for 1-Naphthylamine-7-sulfonic acid
| Signal word | Danger |
| Pictogram(s) |
 Corrosion Corrosives GHS05 |
| GHS Hazard Statements |
H314:Skin corrosion/irritation |
| Precautionary Statement Codes |
P260:Do not breathe dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P363:Wash contaminated clothing before reuse. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 1-Naphthylamine-7-sulfonic acid
| InChIKey | QEZZCWMQXHXAFG-UHFFFAOYSA-N |
1-Naphthylamine-7-sulfonic acid manufacturer
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