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1-Naphthylamine-7-sulfonic acid

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1-Naphthylamine-7-sulfonic acid Basic information

Product Name:
1-Naphthylamine-7-sulfonic acid
Synonyms:
  • TIMTEC-BB SBB000621
  • SODIUM NAPTHIONATE
  • SODIUM NAPHTHIONATE
  • SODIUM 1-NAPHTHYLAMINE-4-SULFONATE
  • PARA-NAPHTHIONIC ACID, NA SALT
  • NAPHTHIONIC ACID SODIUM SALT 0.5-WATER
  • NAPHTHIONIC ACID SODIUM SALT
  • NAPHTHYLAMINE-4-SULFONIC ACID SODIUM SALT
CAS:
119-28-8
MF:
C10H9NO3S
MW:
223.25
EINECS:
204-311-4
Product Categories:
  • Intermediates of Dyes and Pigments
  • Intermediates
Mol File:
119-28-8.mol
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1-Naphthylamine-7-sulfonic acid Chemical Properties

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)
form 
Powder
pka
pK1: 3.66 (25°C)
Merck 
14,2351
BRN 
2115629
InChIKey
QEZZCWMQXHXAFG-UHFFFAOYSA-N
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)
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Safety Information

Hazard Codes 
C
Risk Statements 
34
Safety Statements 
26-36/37/39-45
RIDADR 
UN 2585 8/PG 3
WGK Germany 
2
TSCA 
Yes
HazardClass 
8
PackingGroup 
III
HS Code 
29214500

MSDS

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1-Naphthylamine-7-sulfonic acid Usage And Synthesis

Synthesis

1-Naphthylamine-7-sulfonic acid can be obtained by sulfonation, nitration, neutralization, reduction and acid precipitation of naphthalene.

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.

Uses

Intermediate of dyestuff

Uses

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.

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.

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