Description

4,4'-Dihydrazino-2,2'-Stilbenedisulfonic Acid Disodium Salt is a high-purity, water-soluble organic intermediate featuring dual hydrazino and sulfonate functional groups. This compound matters for its role as a critical building block in the synthesis of optical brighteners, dyes, and specialty polymers, where its unique structure enables precise molecular design. It is primarily needed by manufacturers in the textile, paper, plastics, and fine chemical industries seeking to enhance product whiteness, color fastness, and performance.

Application

• Optical Brightening Agent (OBA) Synthesis: A key precursor for manufacturing stilbene-based fluorescent whitening agents used in detergents, paper, and textiles.
• Reactive Dye Intermediate: Used in the production of high-quality, wash-fast dyes for cotton and other cellulose fibers.
• Polymer Modification: Serves as a functional monomer or cross-linking agent to introduce hydrazide groups into specialty polymer chains.
• Analytical Chemistry Reagent: Employed as a derivatization agent or chelating ligand in specific spectrophotometric detection methods.
• Photographic Chemicals: Used in the formulation of certain photographic developers and sensitizers.
• Bioconjugation Linker: Potential application in biotech for creating protein or antibody conjugates via its reactive hydrazino groups.

Basic Information

Product Name	4,4'-Dihydrazino-2,2'-Stilbenedisulfonic Acid Disodium Salt
CAS No.	63738-90-9
Molecular Formula	C14H14N4Na2O6S2
Molecular Weight	468.39 g/mol
Synonyms	4,4'-Diaminostilbene-2,2'-disulfonic acid, 4,4'-dihydrazide, disodium salt; DASDSA; DSDSA; 4,4'-Dihydrazinostilbene-2,2'-disulfonic Acid Disodium Salt; Disodium 4,4'-dihydrazino-2,2'-stilbenedisulfonate; Tinopal® CBS-X (related derivative); Fluorescent Brightener 351 (related compound); 2,2'-Stilbenedisulfonic acid, 4,4'-dihydrazino-, disodium salt
EINECS	Contact for details

Quality Control

Our 4,4'-Dihydrazino-2,2'-Stilbenedisulfonic Acid Disodium Salt is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture. For long-term storage, consider using an inert atmosphere to minimize oxidation.

Specification

Item	Specification
Appearance	Yellow to light brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%
Solubility (1% in Water)	Clear, yellow solution

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