Description

7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(4-Sulfo-1-Naphthalenyl)Azo]-2-Naphthalenesulfonic Acid]Tetrasodium Salt is a high-purity, water-soluble azo dye intermediate and analytical reagent. This compound is valued for its strong chromophoric properties and ability to form stable complexes with various metal ions, making it a critical component in specialized colorant systems. It is primarily sought by manufacturers in the dye and pigment, analytical chemistry, and specialty chemical synthesis industries for producing vivid colors and as a chelating agent.

Application

• Dye and Pigment Manufacturing: A key intermediate for the synthesis of high-performance, water-soluble azo dyes, particularly for textiles, inks, and leather.
• Analytical Reagent: Used as a complexometric indicator or a chromogenic agent in analytical chemistry for the detection and quantification of specific metal ions.
• Specialty Chemical Synthesis: Serves as a building block for creating advanced functional dyes, optical brighteners, and other complex organic molecules.
• Biological Staining: Potential application in histological and cytological staining procedures in life science research.
• Photographic Industry: Can be utilized in the formulation of light-sensitive layers or color couplers.
• Catalyst Research: Investigated for use as a ligand in catalytic systems due to its multiple coordinating sites.

Basic Information

Product Name	7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(4-Sulfo-1-Naphthalenyl)Azo]-2-Naphthalenesulfonic Acid]Tetrasodium Salt
CAS No.	72845-31-9
Molecular Formula	C42H22N6Na4O16S4
Molecular Weight	1084.88 g/mol
Synonyms	Acid Black 210; C.I. 300310; Tetrasodium 7,7'-ureylenebis[4-hydroxy-3-[(4-sulfo-1-naphthyl)azo]naphthalene-2-sulfonate]; 7,7'-Ureylenebis(4-hydroxy-3-((4-sulfo-1-naphthyl)azo)-2-naphthalenesulfonic acid) tetrasodium salt; Azo Black T; Direct Black 210; CAS 72845-31-9
EINECS	Contact for details

Quality Control

Our production of 7,7'-(Carbonyldiimino)Bis[4-Hydroxy-3-[(4-Sulfo-1-Naphthalenyl)Azo]-2-Naphthalenesulfonic Acid]Tetrasodium Salt adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure consistent purity, color strength, and chemical composition. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and solubility are provided to guarantee compliance with your technical specifications and 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 material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product performance and stability.

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%
Water Solubility	Freely soluble
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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