Description

Disodium 7,7'-(Carbonyldiimino)Bis(4-Hydroxynaphthalene-2-Sulphonate) is a high-purity, water-soluble organic compound belonging to the class of naphthalene sulfonate derivatives. This chemical is valued for its strong chelating properties and its ability to form stable complexes with various metal ions. It serves as a critical intermediate and functional additive for manufacturers in the pharmaceutical, dye, and specialty chemical industries. Our supply ensures consistent quality and reliable performance for your most demanding synthesis and formulation processes.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs), particularly those requiring specific metal-chelating or solubilizing functionalities.
• Analytical Reagent: Functions as a sensitive colorimetric reagent or a complexing agent in analytical chemistry for the detection and quantification of metal ions.
• Dye and Pigment Manufacturing: Acts as an intermediate in the production of azo dyes and other complex organic colorants, contributing to chromophore development.
• Water Treatment Chemical: Employed as a scale inhibitor and dispersant in industrial water systems due to its ability to sequester calcium and magnesium ions.
• Textile Auxiliary: Used in dyeing and printing processes to improve color fastness and uniformity.
• Photographic Chemical: Serves as a component in certain photographic developers and sensitizers.
• Research & Development: A valuable compound for chemical research in coordination chemistry and material science.

Basic Information

Product Name	Disodium 7,7'-(Carbonyldiimino)Bis(4-Hydroxynaphthalene-2-Sulphonate)
CAS No.	20324-87-2
Molecular Formula	C21H12N2Na2O11S2
Molecular Weight	570.43 g/mol
Synonyms	Disodium 4,4'-Carbonylbis[(7-hydroxy-2-naphthalenesulfonate)]; 7,7'-(Carbonyldiimino)bis[4-hydroxy-2-naphthalenesulfonic acid] disodium salt; Acid Chrome Blue K; Chrome Blue K; Mordant Blue 1 (related); Eriochrome Azurol B; C.I. 43830; NSC 403779
EINECS	243-773-1

Quality Control

Our production of Disodium 7,7'-(Carbonyldiimino)Bis(4-Hydroxynaphthalene-2-Sulphonate) adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity, IR for identification, and loss on drying for moisture content, to ensure it meets precise specifications. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and compliance with your quality requirements.

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); therefore, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which may affect product quality and performance.

Specification

Item	Specification
Appearance	Dark blue to purple powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, complete solution

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