Description

Isatin-5-Sulfonic Acid Sodium Salt Dihydrate is a high-purity, functionalized isatin derivative of significant importance in advanced organic synthesis. This compound matters as a key sulfonated building block, enabling the introduction of water-solubilizing and reactive sulfonate groups into complex molecular architectures. It is primarily needed by research institutions and industrial manufacturers in the pharmaceutical, agrochemical, and specialty dye sectors for developing novel active ingredients and functional materials.

Application

• As a versatile synthetic intermediate in the research and development of novel pharmaceutical compounds, particularly kinase inhibitors and receptor antagonists.
• In the synthesis of functional dyes and pigments, where the sulfonate group enhances water solubility and fiber affinity.
• As a specialized building block for creating complex ligands and metal-organic frameworks (MOFs) in material science.
• For the development of analytical reagents and biochemical probes used in diagnostic assays and research.
• In agrochemical research for the synthesis of new herbicidal or pesticidal agents with improved properties.
• As a precursor in the preparation of corrosion inhibitors or specialty surfactants for industrial applications.

Basic Information

Product Name	Isatin-5-Sulfonic Acid Sodium Salt Dihydrate
CAS No.	652154-08-0
Molecular Formula	C8H5NNaO6S · 2H2O
Molecular Weight	293.19 g/mol (Anhydrous basis: 257.18)
Synonyms	5-Sulfoisatin Sodium Salt Dihydrate; Sodium 5-Sulfoisatinate Dihydrate; Isatin-5-sulfonic Acid Sodium Salt; 1H-Indole-2,3-dione, 5-sulfo-, Sodium Salt, Dihydrate; 5-Sulfonatoisatin Sodium Salt; 2,3-Dioxoindoline-5-sulfonate Sodium Salt
EINECS	Contact for details

Quality Control

Our Isatin-5-Sulfonic Acid Sodium Salt Dihydrate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation by IR and NMR spectroscopy, to ensure it meets the high standards required for research and development applications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Yellow to orange-yellow crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 98.0%
Water Content (KF)	10.0 - 13.0 %
Heavy Metals	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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