Description

2,3,3-Trimethyl-3H-Indole-5-Sulfonic Acid is a key sulfonated indole derivative, serving as a crucial intermediate in the synthesis of advanced functional dyes and pigments. Its value lies in providing the essential structural backbone for creating compounds with specific light-absorption and chromophoric properties. This product is primarily needed by manufacturers in the specialty chemicals, dye, and pharmaceutical intermediates sectors.

Application

• Key Intermediate for Cyanine Dyes: A fundamental building block in the synthesis of cyanine and polymethine dyes used in photographic sensitizers and optical recording media.
• Functional Dye Synthesis: Used in the production of specialized dyes for textiles, inks, and coatings that require specific solubility or ionic characteristics.
• Biochemical Research & Stains: Serves as a precursor for developing fluorescent probes and biological stains utilized in life science research and diagnostics.
• Pharmaceutical Intermediate: Employed in the research and development of novel active pharmaceutical ingredients (APIs) with indole-based structures.
• Material Science Applications: Investigated for use in the development of organic semiconductors and nonlinear optical (NLO) materials.

Basic Information

Product Name	2,3,3-Trimethyl-3H-Indole-5-Sulfonic Acid
CAS No.	132557-73-4
Molecular Formula	C11H13NO3S
Molecular Weight	239.29 g/mol
Synonyms	5-Sulfo-2,3,3-trimethyl-3H-indole; 2,3,3-Trimethyl-5-sulfoindolenine; 3H-Indole-5-sulfonic acid, 2,3,3-trimethyl-; Trimethylindoleninesulfonic acid; Indolenine Sulfonic Acid Derivative; Cyanine Dye Intermediate CAS 132557-73-4
EINECS	Contact for details

Quality Control

Our 2,3,3-Trimethyl-3H-Indole-5-Sulfonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing key specifications are provided to guarantee the material meets your research or production 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). Keep away from strong oxidizing agents and strong bases.

Specification

Item	Specification
Appearance	Off-white to light yellow powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition (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.