Description

2,7-Naphthalenedisulfonic Acid, 3,3'-[(3,3'-Dimethoxy[1,1'- Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[5-Amino-4-Hydroxy -, Monolithium Trisodium Salt is a high-purity, water-soluble azo dye intermediate. This compound is valued for its ability to impart strong, stable coloration and its role as a versatile precursor in the synthesis of complex dyes and pigments. It is primarily needed by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Direct and Reactive Dyes: A key building block in the synthesis of high-quality direct dyes for cotton, viscose, and other cellulosic fibers.
• Manufacture of Pigments: Used in the production of organic pigments for inks, plastics, and coatings, offering excellent color strength and stability.
• Specialty Ink Formulations: Employed in the creation of specialized inks for jet printing, security printing, and other high-tech applications.
• Biological Staining: Potential use as a staining agent in histology and microscopy due to its chromophoric properties.
• Research & Development: Serves as a critical reagent in chemical research for developing new chromophores and functional materials.
• Industrial Colorant Production: Integral to manufacturing colorants for paper, leather, and other industrial materials requiring durable color.

Basic Information

Product Name	2,7-Naphthalenedisulfonic Acid, 3,3'-[(3,3'-Dimethoxy[1,1'- Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[5-Amino-4-Hydroxy -, Monolithium Trisodium Salt
CAS No.	75659-72-2
Molecular Formula	C34H24LiN6Na3O14S2
Molecular Weight	888.62 g/mol (approx.)
Synonyms	Direct Black 19; C.I. 35255; Azo Black; 3,3'-[(3,3'-Dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonic acid] lithium sodium salt; Monolithium trisodium 3,3'-[(3,3'-dimethoxy-4,4'-biphenylylene)bis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonate]; Benzidine-based azo dye intermediate; C.I. Direct Black 19
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling. A detailed Certificate of Analysis (COA) documenting identity, purity, and key physical parameters is provided with every shipment to support your quality assurance protocols.

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); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Solubility (in Water)	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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