6-Amino-1-naphthalenesulfonic acid 6-Amino-1-naphthalenesulfonic Acid
Structural formula
| Business number | 01RQ |
|---|---|
| Molecular formula | C10H9NO3S |
| Molecular weight | 223.25 |
| label |
2-Naphthylamine-5-sulfonic acid, 6-Aminonaphthalenesulfonic acid, 2-Naphthylamine-5-sulfonic acid, Fluorescent dyes |
Numbering system
CAS number:81-05-0
MDL number:MFCD00035724
EINECS number:201-318-4
RTECS number:29269095
BRN number:None
PubChem ID:None
Physical property data
1. Properties: White needle-like crystals.
2. Density (g/mL, 25/4℃): Uncertain
3. Relative vapor density (g/mL, air=1): Uncertain
4. Melting point (ºC): 240-245℃ (anhydrous)
5. Boiling point (ºC, normal pressure): Uncertain
6. Boiling point ( ºC, 5.2kPa): Uncertain
7. Refractive index: Uncertain
8. Flash point (ºC): Uncertain
9. Specific optical rotation Degree (º): Uncertain
10. Autoignition point or ignition temperature (ºC): Uncertain
11. Vapor pressure (kPa, 25ºC): Uncertain
12. Saturated vapor pressure (kPa, 60ºC): Uncertain
13. Heat of combustion (KJ/mol): Uncertain
14. Critical temperature (ºC) : Uncertain
15. Critical pressure (KPa): Uncertain
16. Log value of oil-water (octanol/water) partition coefficient: Uncertain
17. Explosion upper limit (%, V/V): Uncertain
18. Explosion lower limit (%, V/V): Uncertain
19. Solubility: Easily soluble It is almost insoluble in water and almost insoluble in alcohol. The aqueous solution shows red and blue fluorescence.
Toxicological data
None yet
Ecological data
None yet
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. Reference value for hydrophobic parameter calculation (XlogP): 1.2
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: none
6. Topological molecule polar surface area 88.8
7. Number of heavy atoms: 15
8. Surface charge: 0
9. Complexity: 322
10. Number of isotope atoms: 0
11. ConfirmDetermined number of atomic stereocenters: 0
12. Uncertain number of atomic stereocenters: 0
13. Determined number of chemical bond stereocenters: 0
14. Number of uncertain chemical bond stereocenters: 0
15. Number of covalent bond units: 1
Properties and stability
None yet
Storage method
This product should be stored in a sealed, cool, dry place away from light.
Synthesis method
It is obtained by sulfonation of β-naphthylamine. The sulfonation reaction is carried out at 50-60°C to generate a mixture of 2-naphthylamine-5-sulfonic acid and 2-naphthylamine-8-sulfonic acid. After diluting with water, add sodium hydroxide solution to adjust the pH to 9, filter and evaporate. Sodium salt is obtained. Then it is extracted and separated with ethanol, and the extract is evaporated to dryness to obtain 2-naphthylamine-5-sulfonic acid sodium salt, which is then hydrolyzed and acidified to obtain the finished product.
Purpose
Dye intermediates. Used to produce acidic complex green B dye.
