Description

44Diaminostilbene is an organic aromatic amine compound, also known as DAS, which serves as a critical intermediate in the synthesis of optical brighteners and dyes. Its conjugated diaminostilbene structure provides the essential chromophore for generating intense fluorescence, making it highly valuable for enhancing whiteness and brightness in materials. This product is primarily sought by manufacturers in the plastics, paper, detergent, and textile industries for producing high-performance fluorescent whitening agents (FWAs).

Application

• Optical Brightener Production: Core intermediate for synthesizing various stilbene-based fluorescent whitening agents (FWAs).
• Textile Industry: Used in the manufacture of brightening agents for cotton, nylon, and other synthetic fibers.
• Paper Manufacturing: Key component in chemicals applied to achieve high-brightness and blue-white shade in papers.
• Detergent Formulations: Incorporated into laundry detergents and fabric softeners to impart a "whiter-than-white" visual effect.
• Plastics and Polymers: Employed in the production of brightening masterbatches for plastics like PVC, polyethylene, and polypropylene.
• Research & Development: Serves as a building block in organic synthesis for novel fluorescent dyes and photoactive materials.

Basic Information

Product Name	44Diaminostilbene
CAS No.	7314-06-9
Molecular Formula	C14H14N2
Molecular Weight	210.28 g/mol
Synonyms	4,4'-Diamino-2,2'-stilbenedisulfonic Acid (uncommon, often confused); DAS; Stilbene 4,4'-diamine; 4,4'-Diaminostilbene; trans-4,4'-Diaminostilbene; 1,1'-(1,2-Ethenediyl)bis[4-aminobenzene]; 4,4'-(Ethene-1,2-diyl)dianiline; Brightener Intermediate
EINECS	230-783-8

Quality Control

Our 44Diaminostilbene is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for sensitive downstream synthesis. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its light-sensitive and easily oxidized nature, it is recommended to store the material under an inert atmosphere (e.g., nitrogen) for long-term preservation and to minimize degradation. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow to light brown crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.