Description

4-[[4-[[[4-[(3-Carboxy-4-Hydroxyphenyl)Azo]Phenyl]Amino]Carbonyl]Phenyl]Azo]-4,5-Dihydro-5-Oxo-1-Phenyl-1H-Pyrazole-3-Carboxylic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its role in synthesizing specialized dyes and pigments, offering excellent color properties and stability. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing vibrant and durable colorants.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of high-performance acid dyes and direct dyes for textiles like wool, silk, and nylon.
• Specialty Pigment Manufacturing: Used in the production of pigments for inks, including printing inks and writing inks, requiring specific color fastness.
• Functional Dye Synthesis: Serves as a precursor for dyes used in research and advanced applications, such as biological staining or light-absorbing materials.
• Colorant for Industrial Products: Employed in the coloration of paper, leather, and other specialty industrial products where a specific hue is required.
• Chemical Research & Development: Utilized in R&D laboratories for developing new chromophores and studying azo dye chemistry and properties.

Basic Information

Product Name	4-[[4-[[[4-[(3-Carboxy-4-Hydroxyphenyl)Azo]Phenyl]Amino]Carbonyl]Phenyl]Azo]-4,5-Dihydro-5-Oxo-1-Phenyl-1H-Pyrazole-3-Carboxylic Acid Disodium Salt
CAS No.	2896-76-6
Molecular Formula	C30H20N6Na2O8
Molecular Weight	638.50 g/mol
Synonyms	Acid Yellow 219; C.I. 18968; 4,5-Dihydro-5-oxo-1-phenyl-4-[[4-[[[4-[(3-carboxy-4-hydroxyphenyl)azo]phenyl]amino]carbonyl]phenyl]azo]-1H-pyrazole-3-carboxylic acid disodium salt; 1H-Pyrazole-3-carboxylic acid, 4,5-dihydro-5-oxo-1-phenyl-4-((4-((4-((3-carboxy-4-hydroxyphenyl)azo)phenyl)amino)carbonyl)phenyl)azo)-, disodium salt; Disodium 5-oxo-1-phenyl-4-[4-[[4-[(3-carboxy-4-hydroxyphenyl)azo]phenyl]carbamoyl]phenyl]azo-4,5-dihydro-1H-pyrazole-3-carboxylate; Yellow 219; Azo dye intermediate 2896-76-6.
EINECS	220-788-9

Quality Control

Our production of this azo dye intermediate adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity. Each lot is tested against established specifications, including HPLC assay, color strength, and impurity profile analysis. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance processes.

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 product is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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