Description

1-Naphthalenesulfonic Acid, 3,3'-[(3,3'-Dimethoxy[1,1'- Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[4-Hydroxy-, Monolithium Monosodium Salt is a high-purity, synthetic azo dye intermediate of significant commercial importance. This compound is valued for its role in producing vivid and stable colorants, particularly in applications requiring specific shades of red and brown. It is primarily sought after by manufacturers in the textile, leather, and specialty ink industries for dye and pigment synthesis.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-performance azo dyes, especially for coloring natural and synthetic fibers.
• Textile Dyeing: Used in the production of dyes for cotton, wool, silk, and nylon, offering good wash and light fastness.
• Leather Finishing: Employed in the formulation of dyes for leather goods, providing deep, uniform coloration.
• Specialty Inks: A component in the manufacture of inks for packaging, security printing, and other industrial applications.
• Paper Coloring: Used in the production of dyes for specialty papers and paper products.
• Research & Development: Serves as a standard or reagent in chemical research focused on dye chemistry and material science.

Basic Information

Product Name	1-Naphthalenesulfonic Acid, 3,3'-[(3,3'-Dimethoxy[1,1'- Biphenyl]-4,4'-Diyl)Bis(Azo)]Bis[4-Hydroxy-, Monolithium Monosodium Salt
CAS No.	75673-35-7
Molecular Formula	C34H24LiN4NaO10S2
Molecular Weight	750.65 g/mol
Synonyms	Lithium Sodium 4-Hydroxy-3-[(E)-[4-[2-[4-[(E)-(3-Hydroxy-4-sulfonato-1-naphthyl)diazenyl]-2-methoxyphenyl]ethenyl]-3-methoxyphenyl]diazenyl]-1-naphthalenesulfonate; C.I. Direct Brown 44; Direct Brown 44; Direct Brown 44, Lithium Sodium Salt; Direct Brown 44 (Lithium Sodium Salt); 1-Naphthalenesulfonic acid, 4-hydroxy-3-[[4-[[2-hydroxy-8-(phenylamino)-1-naphthalenyl]azo]phenyl]azo]-, lithium sodium salt (1:1:1); Azo Dye Intermediate 75673-35-7
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical testing including HPLC, spectrophotometry, and titration methods. A Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with each shipment to support your quality assurance 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); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which may affect product performance.

Specification

Item	Specification
Appearance	Dark Brown to Reddish-Brown Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.