Description

Disodium 4-[(2,4-Dihydroxyphenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonate is a high-purity azo dye intermediate and analytical reagent known for its specific chelating and colorimetric properties. This compound is critical for industries requiring precise color formation or metal ion detection due to its functional hydroxyl and azo groups. It is primarily utilized by manufacturers in the dye and pigment, analytical chemistry, and specialty chemical synthesis sectors.

Application

• Dye and Pigment Intermediate: A key precursor for the synthesis of specific azo dyes and pigments, particularly those requiring complexing with metal ions.
• Analytical Reagent: Used as a colorimetric indicator and chelating agent in analytical chemistry for the detection and quantification of metal ions such as aluminum, iron, and magnesium.
• Complexometric Titration: Serves as a metallochromic indicator in EDTA titrations for determining various metal cations.
• Research & Development: Employed in chemical research for studying azo coupling reactions and developing new chromogenic sensors.
• Specialty Chemical Synthesis: Used as a building block for synthesizing more complex functional molecules with specific optical properties.

Basic Information

Product Name	Disodium 4-[(2,4-Dihydroxyphenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonate
CAS No.	63589-22-0
Molecular Formula	C₁₆H₁₀N₂Na₂O₁₀S₂
Molecular Weight	508.36 g/mol
Synonyms	4-[(2,4-Dihydroxyphenyl)azo]-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt; Acid Chrome Blue K; Chrome Azurol S; Mordant Blue 29; C.I. 43825; Aluminon; Aurintricarboxylic acid ammonium salt derivative; 3-[Bis(3-carboxy-4-hydroxyphenyl)methylene]-6-oxo-1,4-cyclohexadiene-1-carboxylic acid related compound.
EINECS	Contact for details

Quality Control

Our Disodium 4-[(2,4-Dihydroxyphenyl)Azo]-5-Hydroxynaphthalene-2,7-Disulphonate is produced under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via FT-IR and UV-Vis spectroscopy, to ensure it meets precise specifications for use as a reagent and intermediate. Certificates of Analysis (COA) documenting all critical parameters are available upon request.

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 sealed to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Orange to brownish-red powder
Identification (IR)	Conforms to structure
Identification (UV-Vis)	Conforms
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition (Sulfated Ash)	Contact for details
Solubility (in Water)	Freely soluble

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