Description

4,5-Dihydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethyl-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex polyfunctional structure provides excellent chromophoric properties and binding 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 chemical industries seeking to produce vivid, stable colors.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-quality reactive dyes for cotton, wool, and nylon fibers, offering excellent wash and light fastness.
• Specialty Pigment Manufacturing: Used in the production of high-performance organic pigments for inks, coatings, and plastics, where color strength and durability are paramount.
• Functional Dye Synthesis: Serves as a precursor for dyes used in specialized applications, including laser dyes, biological stains, and sensitizers for photographic materials.
• Research & Development: A valuable compound for chemical R&D in academia and industry for developing novel chromophores and studying azo dye chemistry.
• Textile Printing Inks: Utilized in formulating advanced textile printing inks that require brilliant shades and strong substrate adhesion.
• Analytical Chemistry: Can be employed as a complexometric indicator or a standard in analytical methods due to its distinct colorimetric properties.

Basic Information

Product Name	4,5-Dihydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethyl-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt
CAS No.	5442-09-1
Molecular Formula	C34H21N4Na3O14S3
Molecular Weight	874.70 g/mol
Synonyms	Trisodium 4,5-dihydroxy-3-[[4'-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-2,7-naphthalenedisulfonate; C.I. Reactive Black 5 Intermediate; Reactive Black 5 Precursor; Azo Dye Intermediate (Black 5); 3-[[4'-[(1-Hydroxy-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid trisodium salt; Reactive Dye Intermediate K-2B; Tetrasodium? (common industry alias, verify grade).
EINECS	226-646-1

Quality Control

Our production of 4,5-Dihydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-3,3'-Dimethyl-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability for industrial synthesis. Every lot undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation. Certificates of Analysis (COA) detailing all critical specifications are provided and can be tailored to meet specific customer requirements.

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). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture, which can affect purity and handling properties.

Specification

Item	Specification
Appearance	Dark blue to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Water Content (KF)	Max. 5.0%
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	Max. 20 ppm
Solubility in Water	Freely soluble

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