Description

5-Amino-2-[(4-Aminophenyl)Amino]Benzenesulfonic Acid is a high-purity aromatic sulfonic acid derivative featuring multiple amino functional groups, making it a versatile and valuable intermediate in advanced chemical synthesis. Its structure is critical for imparting specific functional properties in downstream products, particularly in color and performance. This compound is essential for manufacturers in the dye, pigment, and specialty chemical industries seeking to develop products with enhanced stability and specific chromophoric characteristics.

Application

• Primary intermediate in the synthesis of azo dyes and pigments, contributing to color strength and lightfastness.
• Key building block for functional polymers and resins requiring sulfonic acid groups for ion-exchange or water-solubility.
• Precursor in the manufacture of optical brightening agents and fluorescent whitening compounds.
• Used in research and development of pharmaceutical intermediates and bioactive molecules.
• Intermediate for corrosion inhibitors and specialty additives in industrial formulations.
• Component in the synthesis of liquid crystal materials and other advanced electronic chemicals.

Basic Information

Product Name	5-Amino-2-[(4-Aminophenyl)Amino]Benzenesulfonic Acid
CAS No.	119-70-0
Molecular Formula	C12H13N3O3S
Molecular Weight	279.32 g/mol
Synonyms	2,5-Diaminobenzenesulfonic Acid, 4'-Amino Derivative; 4-Amino-2',5-diaminodiphenylamine-2-sulfonic Acid; 1,2,4-Benzenetriamine, 6-Sulfo-; 6-Sulfo-1,2,4-benzenetriamine; C.I. 37240; Devol Scarlet B; 5-Amino-2-(4-aminophenylamino)benzenesulfonic acid
EINECS	204-343-5

Quality Control

Our production of 5-Amino-2-[(4-Aminophenyl)Amino]Benzenesulfonic Acid adheres to stringent quality management protocols. Every batch is analyzed to ensure it meets precise chemical and physical specifications, with a standard purity of ≥98% (HPLC). Comprehensive testing includes identification, assay, and impurity profile analysis. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and consistent batch-to-batch quality.

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). This material is light-sensitive and should be stored away from direct light exposure. Keep container tightly sealed when not in use to minimize contact with moisture and air.

Specification

Item	Specification
Appearance	Gray to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition (Sulfated Ash)	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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