Description

Trisodium 2-[2-(4-Nitro-2-Sulphonatophenyl)Vinyl]-5-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Benzenesulphonate is a high-purity, water-soluble anionic dye intermediate of significant commercial importance. Its complex polyazo structure provides exceptional color strength and stability, making it a critical precursor for high-performance dyes. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant, durable, and consistent colorants for demanding applications.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton, viscose, and other cellulosic fibers.
• Direct Dye Production: Used in the manufacture of direct dyes, valued for their ease of application and good wash-fastness on cellulosic materials.
• Specialty Ink Formulations: Serves as a critical component in producing pigments and dyes for high-end inkjet, packaging, and security inks requiring precise color properties.
• Functional Colorants: Employed in the development of colorants for paper, leather, and other industrial applications where water solubility and anionic character are advantageous.
• Research & Development: Used as a standard or starting material in chemical R&D for developing new chromophores and studying dye properties.

Basic Information

Item	Detail
Product Name	Trisodium 2-[2-(4-Nitro-2-Sulphonatophenyl)Vinyl]-5-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Benzenesulphonate
CAS No.	74764-74-2
Molecular Formula	C32H19N5Na3O13S3
Molecular Weight	879.68 g/mol (approx.)
Synonyms	Benzenesulfonic acid, 2-[2-(4-nitro-2-sulfophenyl)ethenyl]-5-[[4-[(4-sulfophenyl)azo]phenyl]azo]-, trisodium salt; C.I. Direct Yellow 142; Direct Yellow 142; Trisodium 4,4'-[1,3,4-thiadiazole-2,5-diylbis(azo)]bis[5-hydroxy-2,7-naphthalenedisulfonate] (related compound); Polyazo dye intermediate; Anionic diazo compound; Water-soluble dye precursor
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques like HPLC and spectrophotometry to confirm identity and strength. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment, ensuring full traceability and compliance with your internal quality standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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 prevent moisture absorption, which can affect handling and performance. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1% w/v
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	7.0 - 9.0

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