6-amino-2-naphthalenesulfonic acid

6-amino-2-naphthalenesulfonic acid structural formula

Structural formula

Business number 025K
Molecular formula C10H9NO3S
Molecular weight 223.25

2-Naphthylamine-6-sulfonic acid,

broronic acid,

6-amino-2-naphthalenesulfonic acid hydrate,

6-amine-2-naphthalenesulfonic acid,

6-Aminonaphthalene-2-sulphonic acid,

2-Naphthylamine-6-sulfonic acid monohydrate

Numbering system

CAS number:93-00-5

MDL number:None

EINECS number:202-208-9

RTECS number:None

BRN number:None

PubChem ID:None

Physical property data

1. Properties: Colorless needle-like crystals.

2. Density (g/mL, 25/4℃): Undetermined

3. Relative vapor density (g/mL, air=1): Undetermined

4. Melting point (ºC): Not determined

5. Boiling point (ºC, normal pressure): Not determined

6. Boiling point (ºC, 5.2kPa): Not determined Determined

7. Refractive index: Undetermined

8. Flash point (ºC): Undetermined

9. Specific rotation (º): Undetermined

10. Autoignition point or ignition temperature (ºC): Undetermined

11. Vapor pressure (kPa, 25ºC): Undetermined

12. Saturation Vapor pressure (kPa, 60ºC): Undetermined

13. Heat of combustion (KJ/mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Log value of oil-water (octanol/water) partition coefficient: Undetermined

17. Explosion upper limit (% , V/V): Undetermined

18. Lower explosion limit (%, V/V): Undetermined

19. Solubility: Dissolved in 7790 parts of cold water at 20°C. Dissolved in 630 parts of boiling water, its aqueous solution (or sodium salt) shows blue fluorescence.

Toxicological data


Ecological data


Molecular structure data

1. Molar refractive index: 58.27

2. Molar volume (cm3/mol): 148.6

3. Isotonic specific volume (90.2K ): 433.1

4. Surface tension (dyne/cm): 72.1

5. Polarizability (10-24cm3): 23.10

Compute chemical data

1. Hydrophobic parameter calculation reference value (XlogP): -0.1

2. Number of hydrogen bond donors: 2

3. Number of hydrogen bond acceptors.��: 4

4. Number of rotatable chemical bonds: 1

5. Number of tautomers:

6. Topological molecule polar surface area ( TPSA): 80.4

7. Number of heavy atoms: 15

8. Surface charge: 0

9. Complexity: 322

10. Number of isotope atoms: 0

11. Number of determined atomic stereocenters: 0

12. Number of uncertain atomic stereocenters: 0

13. The number of determined stereocenters of chemical bonds: 0

14. The number of uncertain stereocenters of chemical bonds: 0

15. The number of covalent bond units: 1

Properties and stability


Storage method


Synthesis method

1. Using naphthol as raw material, it is prepared by aminosulfonation. The amination reaction temperature is 100~190℃, and the sulfonation temperature is 160~190℃. The generated 2-naphthylamine-6-sulfonic acid and 2-Naphthylamine-7-sulfonic acid is separated by salting out to obtain 2-naphthylamine-6-sulfonic acid.

2. Using Schiff’s acid as raw material, it is obtained through Bucherer reaction.


Dye intermediates. It is a naphthalene dye intermediate used in the manufacture of acidic, direct and mordant azo dyes, etc.