Description

2,3,3-Trimethyl-1-(3-Sulfopropyl)-3H-Indolium,Hydroxide,Inner Salt is a zwitterionic indolenine derivative, a key intermediate in the synthesis of functional dyes and advanced materials. Its unique structure, featuring a sulfopropyl group and an inner salt form, provides excellent water solubility and reactivity, making it a versatile building block for specialized applications. This compound is essential for manufacturers and R&D teams in the photochemical, analytical chemistry, and specialty polymer sectors seeking to develop or produce cyanine dyes, fluorescent probes, and other high-value functional molecules.

Application

• Key precursor for the synthesis of cyanine dyes, particularly sulfonated cyanines used in biological labeling and fluorescence imaging.
• Intermediate in the production of near-infrared (NIR) fluorescent probes for medical diagnostics and bioanalytical assays.
• Building block for photosensitizers and functional chromophores used in photodynamic therapy research.
• Raw material for manufacturing light-harvesting materials and organic semiconductors in optoelectronic device development.
• Used in the preparation of reactive dyes for labeling proteins, nucleic acids, and other biomolecules.
• Intermediate for specialty polymerizable dyes and monomers used in advanced material science.
• Starting material in research for non-linear optical (NLO) materials.
• Component in the formulation of specialized analytical reagents and indicators.

Basic Information

Product Name	2,3,3-Trimethyl-1-(3-Sulfopropyl)-3H-Indolium,Hydroxide,Inner Salt
CAS No.	29636-96-2
Molecular Formula	C₁₄H₁₉NO₃S
Molecular Weight	281.37 g/mol
Synonyms	1-(3-Sulfopropyl)-2,3,3-trimethyl-3H-indolium hydroxide, inner salt; 2,3,3-Trimethyl-1-(3-sulfopropyl)indolenium betaine; 3H-Indolium, 2,3,3-trimethyl-1-(3-sulfopropyl)-, hydroxide, inner salt; Sulfopropyl Trimethyl Indolenium Betaine; SPITB; Indolenium Sulfopropyl Betaine; Cyanine Dye Intermediate SP; Trimethylindolenium Sulfopropyl Betaine
EINECS	Contact for details

Quality Control

Our production of 2,3,3-Trimethyl-1-(3-Sulfopropyl)-3H-Indolium,Hydroxide,Inner Salt adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity for sensitive applications. The product undergoes rigorous analytical testing, including HPLC, NMR, and mass spectrometry, to confirm identity and purity. Certificates of Analysis (COA) detailing all specifications are provided with each shipment. We support compliance with relevant research and industry standards, and custom purity grades can be developed to meet specific project requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). This compound is hygroscopic (moisture-sensitive); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. For long-term storage, consider using desiccants. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Off-white to light yellow crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Residue on Ignition	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, colorless to pale yellow solution

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