Description

4,4'-Diamino-3,3'-Biphenyldisulfonic Acid is a high-purity, bifunctional aromatic intermediate containing both amine and sulfonic acid groups. This unique structure makes it a critical building block for synthesizing advanced dyes, pigments, and optical brighteners with enhanced water solubility and chromophoric properties. It is essential for manufacturers in the specialty chemicals sector seeking to develop high-performance colorants and functional materials.

Application

• Dye & Pigment Intermediate: A key precursor for the synthesis of direct dyes, acid dyes, and reactive dyes, particularly valued for creating bright, wash-fast colors on textiles like cotton, wool, and nylon.
• Optical Brightener Production: Serves as a fundamental component in manufacturing stilbene-based optical brightening agents (OBAs) used in paper, detergents, and plastics.
• Functional Polymer Synthesis: Used to introduce sulfonic acid groups into polymer chains, creating ion-exchange resins, proton exchange membranes, and water-soluble polymers.
• Liquid Crystal & Electronic Materials: Employed in the research and development of advanced materials, including liquid crystal polymers and charge-transport layers in electronic devices.
• Bioconjugation & Pharmaceutical Intermediates: Its amine groups allow for coupling reactions, making it useful in producing diagnostic agents and specialized pharmaceutical intermediates.
• Corrosion Inhibitor Formulation: Acts as a component in specialty chemical formulations designed to prevent metal corrosion in industrial systems.

Basic Information

Item	Details
Product Name	4,4'-Diamino-3,3'-Biphenyldisulfonic Acid
CAS No.	3365-90-0
Molecular Formula	C12H12N2O6S2
Molecular Weight	344.36 g/mol
Synonyms	3,3'-Disulfo-4,4'-diaminobiphenyl; 4,4'-Diaminobiphenyl-3,3'-disulfonic Acid; Benzidine-3,3'-disulfonic Acid; DABS Acid; 3,3'-Diaminobiphenyl-4,4'-disulfonic Acid; 4,4'-Diaminodiphenyl-3,3'-disulfonic Acid; C.I. 37240; Direct Black 38 Intermediate
EINECS	222-143-8

Quality Control

Our 4,4'-Diamino-3,3'-Biphenyldisulfonic Acid is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for critical applications. Certificates of Analysis (COA) documenting purity, assay, and impurity profiles are provided with every shipment and are available upon request.

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 nature, the container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Off-white to light gray powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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