Description

4-[[1-Hydroxy-6-[[[[5-Hydroxy-6-[(2-Methoxyphenyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-Sulpho-2-Naphthyl]Azo]Naphthalene-1-Sulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its role in synthesizing complex, high-performance dyes and pigments with excellent color fastness and specific optical properties. It is primarily required by manufacturers in the textile, ink, and specialty chemical sectors seeking to produce vivid and stable colorants.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-grade reactive dyes for cotton and other cellulosic fibers.
• Specialty Pigment Manufacturing: Used in the production of complex organic pigments for high-quality inks, including packaging and security inks.
• Textile Dyeing and Printing: Serves as a crucial component in formulating dyes for textile applications requiring specific shades of red, violet, or black with good wash and light fastness.
• Liquid Crystal Dyes (LCDs): Potential use in the synthesis of dyes for display technologies due to its specific molecular structure.
• Biological Staining: Can be utilized in the development of histological stains for microscopy, given its chromophoric properties.
• Research & Development: Employed in chemical research as a model compound for studying azo dye chemistry, photostability, and metal complexation.

Basic Information

Product Name	4-[[1-Hydroxy-6-[[[[5-Hydroxy-6-[(2-Methoxyphenyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-Sulpho-2-Naphthyl]Azo]Naphthalene-1-Sulphonic Acid, Sodium Salt
CAS No.	83221-78-7
Molecular Formula	C39H26N6O13S3Na2 (or similar, contact for exact stoichiometry)
Molecular Weight	Contact for details
Synonyms	Sodium 4-{[1-hydroxy-6-({[(5-hydroxy-6-[(2-methoxyphenyl)diazenyl]-7-sulfo-2-naphthyl)carbamoyl]amino})sulfonyl]-3-sulfo-2-naphthyl]diazenyl}naphthalene-1-sulfonate; C.I. Reactive Red 238 (related); Azo dye intermediate 83221-78-7; Disodium 1-hydroxy-6-[[5-hydroxy-6-(2-methoxyphenylazo)-7-sulfo-2-naphthyl]carbamoylamino]-3-sulfo-2-naphthylazo-4-naphthalenesulfonate; Reactive dye intermediate; Tetrasulfonated azo dye precursor.
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high chemical purity. Quality is verified through modern analytical techniques including HPLC, UV-Vis spectroscopy, and titration methods. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to support your quality assurance and regulatory needs.

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 hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark red to violet powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (typical)
Moisture Content	≤ 5.0%
Solubility (in Water)	Clear solution at 1% w/v
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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