Description

2,7-Naphthalenedisulfonic Acid, 3,3'-[(3,3'-Dimethoxy[1,1'- Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[5-Amino-4-Hydroxy -, Dilithium Disodium Salt is a high-purity, metal-complex azo dye intermediate. This compound is valued for its role in synthesizing specialized dyes and pigments with enhanced lightfastness and chemical stability. It is primarily required by manufacturers in the textile, ink, and specialty coatings industries seeking to produce high-performance colorants.

Application

• Primary intermediate for the synthesis of high-grade, metal-complex azo dyes and pigments.
• Key component in the production of dyes for textile fibers, particularly for applications requiring good wash and light fastness.
• Used in the formulation of specialty inks, including those for security printing and high-durability applications.
• Employed in the manufacturing of colorants for industrial coatings and plastics.
• Potential use as a staining agent or colorimetric indicator in analytical chemistry and laboratory research.
• Serves as a precursor for functional dyes used in optical data storage and non-linear optical materials.

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 -, Dilithium Disodium Salt
CAS No.	75659-73-3
Molecular Formula	C34H24Li2N6Na2O14S4
Molecular Weight	924.70 g/mol (approx.)
Synonyms	Direct Black 22; C.I. 35435; C.I. Direct Black 22; 3,3'-[(3,3'-Dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonic acid] dilithium disodium salt; Direct Black 22 (Lithium Sodium Salt); Azo Dye Intermediate 75659-73-3; 2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3,3'-[(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis-, lithium sodium salt
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high chemical purity. Quality is verified through advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept 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%
Loss on Drying	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Partially soluble to soluble

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