Description

3H-Indolium,2,3,3-Trimethyl-5-Sulfo-1-(3-Sulfopropyl)-, Inner Salt is a zwitterionic cyanine dye derivative, recognized for its excellent water solubility and photostability. This compound matters for its role as a key intermediate and functional dye in advanced material science and life sciences, offering precise optical properties. It is needed by manufacturers and researchers in the biotechnology, analytical chemistry, and specialty chemical sectors for applications requiring specific light absorption and emission characteristics.

Application

• As a fluorescent probe or labeling agent in biochemical assays and diagnostic kits.
• As a key intermediate in the synthesis of functional cyanine dyes for bioimaging and flow cytometry.
• In the formulation of photosensitizers for photodynamic therapy research.
• As a spectral sensitizer in specialized photographic and imaging materials.
• For research and development of non-linear optical materials and photonic devices.
• As a water-soluble tracer dye in industrial and environmental testing.
• In the development of light-harvesting complexes and energy transfer systems.

Basic Information

Product Name	3H-Indolium,2,3,3-Trimethyl-5-Sulfo-1-(3-Sulfopropyl)-, Inner Salt
CAS No.	76578-90-0
Molecular Formula	C17H23N2O6S2
Molecular Weight	415.50 g/mol
Synonyms	2,3,3-Trimethyl-5-sulfo-1-(3-sulfopropyl)-3H-indolium, inner salt; 1-(3-Sulfopropyl)-2,3,3-trimethyl-5-sulfo-3H-indolium hydroxide, inner salt; Cy3 hydrazide precursor; Sulfo-Cyanine3 acid derivative; Water-soluble indolenine dye; Zwitterionic indolium dye; 5-Sulfo-1-(3-sulfopropyl)-2,3,3-trimethylindolenine betaine
EINECS	Contact for details

Quality Control

Our 3H-Indolium,2,3,3-Trimethyl-5-Sulfo-1-(3-Sulfopropyl)-, Inner Salt is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and spectroscopic methods for identity confirmation, to ensure it meets precise customer specifications. 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, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark red to purple powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Residue on Ignition	≤ 1.0%
UV-Vis Absorption (λmax)	Conforms to reference

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