Description

4-(2,3,4-Trihydroxyphenylazo)Benzenesulfonic Acid is an azo dye intermediate and analytical reagent characterized by its distinct chromophoric structure. This compound matters for its ability to form stable, colored complexes with various metal ions, making it a valuable tool in detection and quantification processes. Industries requiring precise chemical analysis, such as research laboratories and specialty chemical manufacturing, rely on this high-purity intermediate for its consistent performance and reactivity.

Application

• Analytical Reagent: Used as a colorimetric indicator and complexing agent in the spectrophotometric determination of metal ions like aluminum, iron, and gallium.
• Dye & Pigment Intermediate: Serves as a key precursor in the synthesis of specific azo dyes and pigments, particularly those requiring high lightfastness and complexing properties.
• Research & Development: Employed in chemical research for studying coordination chemistry, developing new sensor materials, and creating novel chromogenic substrates.
• Photographic Chemicals: Can be utilized in the formulation of certain specialized photographic chemicals and sensitizers.
• Biochemical Staining: Potential use as a histological stain or in biochemical assays due to its metal-binding and color-producing characteristics.

Basic Information

Product Name	4-(2,3,4-Trihydroxyphenylazo)Benzenesulfonic Acid
CAS No.	64789-21-5
Molecular Formula	C12H10N2O7S
Molecular Weight	326.28 g/mol
Synonyms	Benzenesulfonic acid, 4-[(2,3,4-trihydroxyphenyl)azo]-; 4-(2,3,4-Trihydroxy-phenylazo)-benzenesulfonic acid; 1,2,3-Trihydroxy-4-(4-sulfophenylazo)benzene; Aurintricarboxylic Acid Ammonium Salt related compound; Tiron analog; Azo dye intermediate CAS 64789-21-5; Pyrocatechol Violet related compound
EINECS	Contact for details

Quality Control

Our 4-(2,3,4-Trihydroxyphenylazo)Benzenesulfonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets high-grade specifications for research and industrial use. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and consistency.

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 material is light-sensitive and should be stored away from direct light exposure. Keep the container tightly sealed to minimize contact with atmospheric moisture.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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