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)

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

• Language:English Provider:SigmaAldrich

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.

1-Naphthylamine-7-sulfonic acid(119-28-8)Related Product Information

• p-Toluenesulfonic acid
• Nickel bis(sulphamidate)
• Naphthalene-2-sulfonic acid
• 1-DODECANESULFONIC ACID SODIUM SALT
• Taurine
• Sodium 2-naphthalenesulfonate
• Ammonium sulfamate
• Molasses
• 4-Amino-benzenesulfonic acid monosodium salt
• 6-Aminocaproic acid
• Amlodipine Besylate
• 1-Naphthylamine
• Glycine
• Folic acid
• Sulfamic acid
• Sulfanilic acid
• Sulfamic acid monosodium salt
• Ascoric Acid