Description

Trisodium 2-[[2-amino-5-hydroxy-6-[[4'-[(2-hydroxy-6-sulphonato-1-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-7-sulphonato-1-naphthyl]azo]-5-nitrobenzoate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its complex polyazo structure provides exceptional color strength and specific affinity, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, durable colors with excellent fastness properties.

Application

• Primary Intermediate for Reactive Dyes: Key building block for synthesizing high-grade reactive dyes used in cotton and cellulose fiber dyeing and printing.
• Specialty Pigment Manufacturing: Used in the production of high-performance organic pigments for inks, plastics, and coatings requiring excellent lightfastness and weather resistance.
• Textile Industry: Serves as a crucial component in the formulation of dyes for wool, silk, and nylon, offering a wide color gamut.
• Research & Development: Used in chemical research for developing novel chromophores and studying azo dye chemistry and applications.
• Functional Dyes: Potential intermediate for creating dyes with specialized functions, such as those used in optical data storage or as biological stains.

Basic Information

Item	Details
Product Name	Trisodium 2-[[2-amino-5-hydroxy-6-[[4'-[(2-hydroxy-6-sulphonato-1-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-7-sulphonato-1-naphthyl]azo]-5-nitrobenzoate
CAS No.	71566-41-1
Molecular Formula	C49H31N7Na3O16S3
Molecular Weight	~1150.94 g/mol
Synonyms	Reactive Black 5 Intermediate; Polyazo Dye Intermediate; Trisodium 5-nitro-2-[[2-amino-5-hydroxy-6-[[4'-[(2-hydroxy-6-sulphonato-1-naphthyl)azo]-3,3'-dimethoxybiphenyl-4-yl]azo]-7-sulphonato-1-naphthyl]azo]benzoate; Azo Dye Precursor CAS 71566-41-1; C.I. Reactive Black 5 related intermediate; Tetrasodium? (common trade variant) salt of polyazo dye acid
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Quality is verified through a comprehensive suite of analytical techniques including HPLC for purity and isomer distribution, spectrophotometry for color value, and elemental analysis. A Certificate of Analysis (COA) detailing assay, impurity profile, physical properties, and identification is provided with every shipment to support your quality assurance and regulatory needs.

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 prevent moisture absorption, which can affect purity and handling properties. Keep away from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (in Water)	Clear solution at 1%
Heavy Metals (as Pb)	Max. 20 ppm
Sulfated Ash	Within typical range

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