Description

5,5'-Dihydroxy-2,2'-Dinaphthylamine-7,7'-Disulphonic Acid is a specialized aromatic disulfonic acid derivative, serving as a critical intermediate in the synthesis of high-performance dyes and pigments. Its molecular structure provides excellent chelating and chromophoric properties, making it indispensable for creating vivid and stable colors. This compound is primarily sought by manufacturers in the dye and pigment industry, as well as researchers developing advanced functional materials.

Application

• Dye Intermediate: A key precursor for the synthesis of acid dyes, direct dyes, and reactive dyes, particularly for textiles like wool, silk, and nylon.
• Pigment Manufacturing: Used in the production of high-grade organic pigments for inks, paints, plastics, and coatings, offering enhanced color strength and lightfastness.
• Complexometric Agent: Its structure allows it to act as a chelating agent in certain analytical and industrial processes.
• Research & Development: Employed in academic and industrial R&D for developing novel chromophores, fluorescent markers, or specialty polymers.
• Photographic Chemicals: Can be utilized in the synthesis of certain photographic chemicals and sensitizers.

Basic Information

Product Name	5,5'-Dihydroxy-2,2'-Dinaphthylamine-7,7'-Disulphonic Acid
CAS No.	87-03-6
Molecular Formula	C₂₀H₁₄N₂O₈S₂
Molecular Weight	474.46 g/mol
Synonyms	5,5'-Dihydroxy-2,2'-dinaphthylamine-7,7'-disulfonic Acid; 7,7'-Disulfo-5,5'-dihydroxy-2,2'-dinaphthylamine; Chicago Acid; 2,2'-Diamino-1,1'-dinaphthyl-5,5',7,7'-tetrol-7,7'-disulfonic Acid; 5,5'-Dihydroxy-7,7'-disulfo-2,2'-dinaphthylamine; Dinaphthylamine Disulfonic Acid Derivative
EINECS	201-721-7

Quality Control

Our production of 5,5'-Dihydroxy-2,2'-Dinaphthylamine-7,7'-Disulphonic Acid adheres to stringent quality management protocols. Every batch is analyzed to ensure consistent purity, identity, and performance characteristics. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with each shipment to guarantee supply reliability and product consistency for your 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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