Description

2,2'-[[4-Hydroxy-6-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]-1,3-phenylene]bis(azo-4,1-phenyleneimino)]bis(5-nitrobenzenesulfonic acid) is a high-purity, complex azo dye intermediate essential for producing vibrant and stable colorants. This compound matters for manufacturers requiring precise molecular structures to achieve specific shades and performance characteristics in demanding applications. It is primarily needed by industrial-scale producers of dyes and pigments for textiles, inks, and specialty coatings where color fastness and consistency are critical.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of high-performance, polyazo direct and reactive dyes.
• Textile Dyeing: Used in the manufacturing of dyes for coloring cotton, wool, and other natural and synthetic fibers.
• Ink Formulation: Serves as a precursor for pigments used in printing inks, providing intense color and stability.
• Specialty Coatings: Employed in the production of colorants for industrial and automotive coatings.
• Research & Development: Utilized in chemical research for developing novel chromophores and studying dye chemistry.

Basic Information

Item	Details
Product Name	2,2'-[[4-Hydroxy-6-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]-1,3-phenylene]bis(azo-4,1-phenyleneimino)]bis(5-nitrobenzenesulfonic acid)
CAS No.	72139-02-7
Molecular Formula	C46H32N12O18S4
Molecular Weight	1153.06 g/mol
Synonyms	Direct Black 166 (C.I. 30026); C.I. Direct Black 166; Direct Black 166; 2,2'-[[4-Hydroxy-6-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]-1,3-phenylene]bis(azo-4,1-phenyleneimino)]bis(5-nitrobenzenesulfonic acid); Benzenesulfonic acid, 2,2'-[[4-hydroxy-6-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]-1,3-phenylene]bis(azo-4,1-phenyleneimino)]bis(5-nitro-; Direct Black 166 dye intermediate
EINECS	Contact for details

Quality Control

Our 2,2'-[[4-Hydroxy-6-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]-1,3-phenylene]bis(azo-4,1-phenyleneimino)]bis(5-nitrobenzenesulfonic acid) is produced under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure identity, purity, and consistency meet the high standards required for industrial dye synthesis. Certificates of Analysis (COA) detailing key specifications are available upon request to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Sulfated Ash	≤ 1.0%

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