Description

3,3'-Dioxo[δ2,2'-Biindoline]-5-Sulfonic Acid is a high-purity, sulfonated indoline derivative used as a critical synthetic intermediate and functional dye precursor. Its value lies in its unique molecular structure, which provides excellent water solubility and reactive sites for further chemical modification. This compound is essential for researchers and manufacturers in the pharmaceutical, specialty chemical, and advanced materials sectors, particularly for developing novel chromophores and active pharmaceutical ingredients (APIs).

Application

• Pharmaceutical Intermediate: Key building block in the synthesis of novel drug candidates and active pharmaceutical ingredients (APIs).
• Functional Dye Synthesis: Precursor for manufacturing water-soluble dyes, pigments, and fluorescent markers.
• Bioconjugation Reagent: Used to label proteins, peptides, and other biomolecules due to its reactive sulfonic acid group.
• Analytical Chemistry: Serves as a derivatization agent or a standard in chromatographic analysis and spectroscopic studies.
• Polymer Chemistry: Monomer or additive for creating functional polymers with specific optical or ionic properties.
• Research & Development: Valuable tool in organic synthesis and materials science research for exploring new chemical entities.

Basic Information

Product Name	3,3'-Dioxo[δ2,2'-Biindoline]-5-Sulfonic Acid
CAS No.	605-18-5
Molecular Formula	C16H10N2O6S
Molecular Weight	358.33 g/mol
Synonyms	5-Sulfoisatin Dimer; δ2,2'-Biindoline-3,3'-dione-5-sulfonic Acid; Isatin-5-sulfonic Acid Dimer; 3H,3'H-[2,2'-Biindole]-3,3'-dione-5-sulfonic Acid; 5-Sulfonated Isatin Dimer; Acid Red 52 Intermediate; C.I. 45100 Intermediate; 5-Sulfoindirubin Analog
EINECS	Contact for details

Quality Control

Our 3,3'-Dioxo[δ2,2'-Biindoline]-5-Sulfonic Acid is produced under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via FT-IR and NMR spectroscopy, to ensure it meets exacting standards for research and industrial use. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). The product is light-sensitive and should be handled accordingly to maintain stability.

Specification

Item	Specification
Appearance	Yellow to orange-brown powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in water, alkaline solutions

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