Description

2-Amino-5-[(3-Phosphonophenyl)Azo]Benzenesulfonic Acid is a specialized azo dye intermediate characterized by its unique bifunctional structure, incorporating both sulfonic and phosphonic acid groups. This molecular architecture provides excellent water solubility and strong chelating properties, making it a valuable precursor for creating high-performance, metal-complex dyes and pigments. It is primarily utilized by manufacturers in the textile, ink, and specialty chemical industries seeking to develop products with enhanced color fastness and specific functional characteristics.

Application

• Primary Intermediate for Metal-Complex Dyes: Serves as a key building block in the synthesis of azo dyes that form stable complexes with metals like chromium, cobalt, and copper, resulting in dyes with superior light and wash fastness.
• Textile Dyeing and Printing: Used in the production of dyes for coloring natural and synthetic fibers, particularly where high durability is required.
• Functional Pigments for Inks and Coatings: Employed in creating pigments for industrial inks, paints, and coatings that demand specific chemical resistance or optical properties.
• Analytical Reagent and Chelating Agent: Its phosphonic acid group makes it useful as a chelating agent in water treatment formulations or as a specialized reagent in analytical chemistry for metal ion detection.
• Research & Development: Utilized in chemical R&D for developing new functional materials, sensors, or advanced colorants.

Basic Information

Item	Detail
Product Name	2-Amino-5-[(3-Phosphonophenyl)Azo]Benzenesulfonic Acid
CAS No.	70911-48-7
Molecular Formula	C12H11N4O6PS
Molecular Weight	370.28 g/mol
Synonyms	Benzenesulfonic acid, 2-amino-5-[(3-phosphonophenyl)azo]-; 3-[(4-Amino-3-sulfophenyl)azo]benzenephosphonic Acid; 2-Amino-5-(3-phosphonophenylazo)benzenesulfonic acid; Azo dye intermediate 70911-48-7; Phosphonated azo dye intermediate; 4-Amino-3-(3-phosphonophenylazo)benzenesulfonic acid
EINECS	Contact for details

Quality Control

Every batch of 2-Amino-5-[(3-Phosphonophenyl)Azo]Benzenesulfonic Acid is manufactured under a strict quality management system. We employ advanced analytical techniques including HPLC, IR spectroscopy, and titration to ensure product identity, purity, and consistency. Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) detailing batch-specific results are available upon request.

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 compound is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed to minimize exposure to atmospheric humidity. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Brown to dark brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
pH (1% Solution)	2.0 - 4.0
Heavy Metals (as Pb)	≤ 20 ppm

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