4,4"-Diamino-2,2'-Stilbenedisulfonic Acid CAS#81-11-8
High Reactivity as an Intermediate: Serves as a key intermediate in the production of fluorescent whitening agents and optical brighteners, ensuring efficient downstream synthesis.
Excellent Water Solubility: The presence of sulfonic acid groups provides strong water solubility, facilitating easy processing and formulation.
Functional Chemical Structure: Contains both amino and sulfonic acid groups on a stilbene backbone, enabling versatile chemical modifications and high performance in dye synthesis.
Wide Industrial Application: Widely used in textile and paper industries, supporting the production of high-quality dyes and brightening agents.
4,4'-Diamino-2,2'-stilbenedisulfonic acid (CAS# 81-11-8), often known as Amsonic Acid, is a light yellow crystalline powder, primarily used as a key intermediate in the synthesis of fluorescent whitening agents and optical brighteners for the textile and paper industries. It is a water-soluble compound featuring amino and sulfonic acid groups on a stilbene backbone, acting as an important chemical for producing dyes and brightening agents.
4,4'-Diamino-2,2'-stilbenedisulfonic acid Chemical Properties
| Melting point | 300 °C |
| Density | 1.4732 (rough estimate) |
| Vapor pressure | 1.3hPa at 25℃ |
| Refractive index | 1.6510 (estimate) |
| Storage temp | Keep in dark place,Inert atmosphere,Room temperature |
| Solubility | Aqueous Base (Slightly) |
| Pka | -1.58±0.50(Predicted) |
| Form | Crystalline Powder |
| Color | Cream to yellow-brown |
| Water Solubility | <0.1 g/100 mL at 23 ºC |
| Merck | 14595 |
| BRN | 629516 |
| Stability | Stable. Combustible. Incompatible with iron, strong oxidizing agents. |
| LogP | -1.7--1.42 at 25℃ |
| CAS DataBase Reference | 81-11-8(CAS DataBase Reference) |
| EPA Substance Registry System | Amsonic acid (81-11-8) |
Safety Information
| Hazard Codes | C,Xn |
| Risk Statements | 34-22-36/37/38-20/21/22 |
| Safety Statements | 24/25-45-36/37/39-26-22 |
| RIDADR | UN 2583 |
| RTECS | WJ6603000 |
| TSCA | Yes |
| HS Code | 29215900 |
| Hazardous Substances Data | 81-11-8(Hazardous Substances Data) |
Product Applications of 4,4'-Diamino-2,2'-stilbenedisulfonic acid (CAS#81-11-8)
Primarily utilized in the manufacture of optical brighteners, as well as in the production of Direct Yellow G and Direct Yellow R dyes. It is also applied in pesticide formulations.
Additionally, it serves as an important intermediate in the synthesis of dyes and optical brightening agents.
