Description

4-[5-[3-Carboxy-5-hydroxy-1-[(2-sulfophenyl)methyl]-1H-pyrazol-4-yl]-2,4-pentadienylidene]-4,5-dihydro-5-oxo-1-[(2-sulfophenyl)methyl]-1H-pyrazole-3-carboxylic acid tetrasodium salt is a high-purity, water-soluble organic dye intermediate belonging to the pyrazolone class. This compound is valued for its role as a key precursor in the synthesis of high-performance, azo dyes and pigments, particularly those requiring bright, stable colors and good solubility. It is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to develop products with enhanced color fastness and application properties.

Application

• Primary Intermediate for Azo Dyes: A crucial building block for synthesizing reactive, acid, and direct dyes used in textile dyeing and printing.
• Pigment Manufacturing: Used in the production of high-quality organic pigments for inks, plastics, and coatings.
• Specialty Colorants: Serves as a precursor for colorants in advanced applications like laser dyes, security inks, and functional materials.
• Research & Development: A valuable compound for chemical R&D in developing novel chromophores and dye systems.
• Analytical Reagents: Potential use as a complexometric agent or indicator in specific analytical chemistry methods.

Basic Information

Item	Details
Product Name	4-[5-[3-Carboxy-5-hydroxy-1-[(2-sulfophenyl)methyl]-1H-pyrazol-4-yl]-2,4-pentadienylidene]-4,5-dihydro-5-oxo-1-[(2-sulfophenyl)methyl]-1H-pyrazole-3-carboxylic acid tetrasodium salt
CAS No.	118131-65-0
Molecular Formula	C30H20N4Na4O14S2
Molecular Weight	810.57 g/mol
Synonyms	Acid Yellow 220 (C.I. 22095); Tetrasodium 4,4'-(1,4-phenylenedi-2,1-ethenediyl)bis[3-hydroxy-1-(2-sulfobenzyl)-5-pyrazolecarboxylate]; C.I. Acid Yellow 220; Food Yellow 5; Lissamine Yellow 2G; Pyrazolone Yellow; 1H-Pyrazole-3-carboxylic acid, 4,4'-(1,4-phenylenedi-2,1-ethenediyl)bis[4,5-dihydro-5-oxo-1-[(2-sulfophenyl)methyl]-, tetrasodium salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every lot is analyzed using advanced techniques like HPLC and spectrophotometry to verify critical parameters including assay, color strength, and impurity profile. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with each shipment 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Loss on Drying	≤ 5.0%
Sulfated Ash	28.0 - 32.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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