Description

3,3'-[(2,2'-Disulfo[1,1'-Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[6-Hydroxy-4-Methylbenzoic Acid]Tetrasodium Salt is a high-purity, water-soluble azo dye intermediate and analytical reagent. This compound is valued for its strong chromophoric properties and ability to form stable complexes with various metal ions. It is primarily utilized by manufacturers in the dye and pigment industry, as well as by research laboratories for colorimetric analysis and diagnostic applications.

Application

• Dye and Pigment Synthesis: A key intermediate for producing high-value, water-soluble azo dyes and pigments, particularly for textiles, inks, and coatings.
• Analytical Chemistry Reagent: Used as a colorimetric indicator or complexing agent in analytical methods for detecting and quantifying metal ions.
• Biological Staining: Potential application in histological and cytological staining procedures in life science research.
• Chemical Sensor Development: A functional component in the development of optical chemical sensors due to its specific color change upon binding.
• Photographic Industry: Can be used in specialized photographic processes and light-sensitive materials.
• Research & Development: Serves as a building block for novel organic compounds in academic and industrial R&D settings.

Basic Information

Product Name	3,3'-[(2,2'-Disulfo[1,1'-Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[6-Hydroxy-4-Methylbenzoic Acid]Tetrasodium Salt
CAS No.	72379-54-5
Molecular Formula	C34H20N4O14S2Na4
Molecular Weight	858.68 g/mol
Synonyms	Acid Red 359; Tetrasodium 3,3'-[(2,2'-disulfo[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis(6-hydroxy-4-methylbenzoate); C.I. 18260; 3,3'-[(2,2'-Disulfobiphenyl-4,4'-diyl)di(E)diazene-2,1-diyl]bis(6-hydroxy-4-methylbenzoic acid) tetrasodium salt; 4,4'-Bis[(6-hydroxy-4-methyl-3-carboxyphenyl)azo]-2,2'-biphenyldisulfonic acid tetrasodium salt; Direct Red 81 (related class); Azo dye intermediate 72379-54-5
EINECS	Contact for details

Quality Control

Our 3,3'-[(2,2'-Disulfo[1,1'-Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[6-Hydroxy-4-Methylbenzoic Acid]Tetrasodium Salt is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications. Certificates of Analysis (COA) documenting all critical parameters are provided with every shipment.

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 tightly sealed after use to prevent moisture absorption, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark red to brownish-red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
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.