Description

4-[[4-[[3-(4,5-dichloro-6-oxo-6H-pyridazin-1-yl)propionyl]amino]-2-sulphophenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid, sodium salt is a high-purity, water-soluble anionic dye intermediate of significant commercial importance. Its complex molecular structure, featuring a pyridazinone core linked to a pyrazole carboxylic acid via an azo bridge, makes it a critical precursor for synthesizing high-performance dyes and pigments. This compound is primarily sought after by manufacturers in the textile, ink, and specialty chemical industries for producing vivid and stable colorants.

Application

• Primary intermediate for reactive and direct dyes used in cotton and cellulose fiber dyeing.
• Key building block for high-grade inkjet inks, contributing to color fastness and brilliance.
• Precursor in the synthesis of specialized pigments for plastics and coatings.
• Research and development chemical for novel chromophores and functional dyes.
• Manufacturing of colorants for paper and leather applications.
• Potential use in the development of dye-based sensors and analytical reagents.

Basic Information

Product Name	4-[[4-[[3-(4,5-dichloro-6-oxo-6H-pyridazin-1-yl)propionyl]amino]-2-sulphophenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulphophenyl)-1H-pyrazole-3-carboxylic acid, sodium salt
CAS No.	85959-08-6
Molecular Formula	C24H16Cl2N6O11S2Na2 (or corresponding acid form)
Molecular Weight	Contact for details
Synonyms	Pyridazinone Azo Dye Intermediate; Acid Red 337 (related dye class); Sodium 4-[[4-[[3-(4,5-dichloro-6-oxopyridazin-1-yl)propanoyl]amino]-2-sulfophenyl]azo]-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylate; Reactive Dye Intermediate 85959-08-6; Azo Pyrazole Pyridazinone Derivative; C.I. Reactive Red 45 Intermediate (potential); Water-soluble Anionic Dye Precursor
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Quality is verified through advanced analytical techniques including HPLC, UV-Vis spectroscopy, and elemental analysis. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles 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 place 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 product stability and handling properties.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 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.