Description

4,5-Dihydroxy-3-[(4-Nitro-2-Phosphonophenyl)Azo]-2,7-Naphthalenedisulfonic Acid is a specialized azo dye intermediate characterized by its unique functional groups, including phosphonic acid and sulfonic acid moieties. This compound is valued for its ability to form stable, colored complexes with metal ions, making it a critical component in the synthesis of high-performance dyes and pigments. It is primarily sought after by manufacturers in the textile, leather, and specialty chemical industries for creating vibrant, wash-fast colors and for advanced applications in analytical chemistry and material science.

Application

• Textile Dyeing: As a key intermediate for synthesizing reactive and direct dyes, providing excellent color fastness and brightness on cotton and other cellulosic fibers.
• Leather Coloring: Used in the production of dyes for leather finishing, offering deep, uniform shades with good adhesion.
• Metal Complex Dyes: Serves as a chelating ligand to form stable, lightfast metal-complex dyes used in inks, plastics, and automotive coatings.
• Analytical Reagent: Employed in analytical chemistry as a colorimetric reagent for the detection and quantification of specific metal ions.
• Specialty Pigments: A precursor for manufacturing high-performance organic pigments used in paints, inks, and colored plastics.
• Research & Development: Utilized in chemical research for developing new functional dyes, sensors, and advanced materials.

Basic Information

Product Name	4,5-Dihydroxy-3-[(4-Nitro-2-Phosphonophenyl)Azo]-2,7-Naphthalenedisulfonic Acid
CAS No.	18029-36-2
Molecular Formula	C₁₆H₁₁N₃O₁₂PS₂
Molecular Weight	556.38 g/mol
Synonyms	4,5-Dihydroxy-3-[(4-nitro-2-phosphonophenyl)azo]-2,7-naphthalenedisulfonic acid; 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-[(4-nitro-2-phosphonophenyl)azo]-; Acid Black 210; C.I. 30027; Azo Dye Intermediate CAS 18029-36-2; Phosphonated Azo Dye; 3-[(4-Nitro-2-phosphonophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid
EINECS	Contact for details

Quality Control

Our production of 4,5-Dihydroxy-3-[(4-Nitro-2-Phosphonophenyl)Azo]-2,7-Naphthalenedisulfonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure consistent purity, color strength, and chemical identity. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, impurity profile, and physical characteristics. Our commitment to quality ensures reliability for your critical synthesis and manufacturing processes.

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 product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
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.