Description

1-(2,3-Dihydroxy-4-Pyridylazo)Benzene-4-Sulfonic Acid is a specialized azo dye derivative and analytical reagent valued for its strong chelating properties and chromogenic response to specific metal ions. This compound is essential for researchers and industrial chemists requiring precise colorimetric detection and quantification. It is primarily utilized in analytical chemistry for metal ion analysis and in the development of specialized dyes and indicators.

Application

• Analytical Reagent: Used as a sensitive colorimetric reagent for the detection and spectrophotometric determination of transition metal ions such as iron, copper, and cobalt in various matrices.
• Chelating Agent: Functions as a selective complexing agent in separation sciences and extraction processes due to its pyridylazo and sulfonic acid functional groups.
• Research & Development: Serves as a key intermediate or reference standard in chemical research, particularly in synthesizing novel azo dyes and ligands.
• Indicator Chemistry: Employed in the formulation of pH indicators or metal-specific indicators for titration and diagnostic kits.
• Dye Intermediate: Acts as a precursor in the synthesis of specialized azo dyes for non-textile applications, including inks and pigments.
• Laboratory Standards: Used to prepare certified reference materials (CRMs) for quality control and calibration in analytical laboratories.

Basic Information

Product Name	1-(2,3-Dihydroxy-4-Pyridylazo)Benzene-4-Sulfonic Acid
CAS No.	65837-78-7
Molecular Formula	C11H9N3O5S
Molecular Weight	295.27 g/mol
Synonyms	1-(2,3-Dihydroxy-4-pyridylazo)-4-sulfobenzene; 4-[(2,3-Dihydroxy-4-pyridinyl)azo]benzenesulfonic Acid; PDSA; 2,3-Dihydroxy-4-[(4-sulfophenyl)azo]pyridine; Benzenesulfonic acid, 4-[(2,3-dihydroxy-4-pyridinyl)azo]-; 1-(2,3-Dihydroxypyridin-4-ylazo)benzene-4-sulfonic acid
EINECS	Contact for details

Quality Control

Our 1-(2,3-Dihydroxy-4-Pyridylazo)Benzene-4-Sulfonic Acid is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via FT-IR and NMR spectroscopy, to ensure it meets exacting standards for research and industrial use. A Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee traceability and compliance.

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 nature, the container must be kept sealed to minimize exposure to atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Orange to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in water, alkaline solutions

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