Description

5-Chloro-2-[2-[4-[(2-Cyanoethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium chloride is a specialized cationic cyanine dye intermediate of significant commercial importance. This compound is valued for its precise molecular structure, which serves as a critical building block in the synthesis of advanced functional dyes and pigments. It is primarily sought after by manufacturers in the photographic, optical data storage, and biomedical imaging sectors for developing high-performance light-absorbing materials.

Application

• Photosensitizer and Dye Intermediate: A key precursor in the synthesis of heptamethine cyanine dyes and other near-infrared (NIR) absorbing chromophores.
• Optical Recording Media: Used in the formulation of dyes for recordable compact discs (CD-R) and digital versatile discs (DVD-R).
• Biomedical Imaging Probes: Serves as a foundational structure for developing fluorescent labels and contrast agents used in bioassays and diagnostic imaging.
• Laser and Nonlinear Optical Materials: Incorporated into materials designed for laser technology and optical limiting applications due to its strong absorption properties.
• Photodynamic Therapy (PDT) Research: Investigated as a potential photosensitizer component in therapeutic agents for targeted cancer treatments.
• Specialty Inks and Coatings: Employed in the production of high-security inks and functional coatings requiring specific spectral characteristics.

Basic Information

Item	Detail
Product Name	5-Chloro-2-[2-[4-[(2-Cyanoethyl)ethylamino]-o-tolyl]vinyl]-1,3,3-trimethyl-3H-indolium Chloride
CAS No.	32783-03-2
Molecular Formula	C25H29ClN3 • Cl
Molecular Weight	439.87 g/mol (for the chloride salt)
Synonyms	5-Chloro-2-[2-[4-[(2-cyanoethyl)ethylamino]-2-methylphenyl]ethenyl]-1,3,3-trimethyl-3H-indolium chloride; Cyanine dye intermediate 32783-03-2; 1,3,3-Trimethyl-2-[2-[4-[(2-cyanoethyl)ethylamino]-2-methylphenyl]ethenyl]-5-chloro-3H-indolium chloride; NK-2016 (potential research code); Heptamethine cyanine dye precursor; Indolium dye salt; NIR dye intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity. Every lot is characterized using advanced analytical techniques, including HPLC, NMR, and mass spectrometry, to confirm identity and purity. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with each shipment to support your quality assurance and R&D processes.

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 material is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed and under an inert atmosphere (e.g., nitrogen or argon) for long-term storage to prevent degradation.

Specification

Item	Specification
Appearance	Dark green to blue-black crystalline powder
Identification (HPLC)	Conforms to reference standard
Identification (IR)	Conforms to reference spectrum
Purity (HPLC, Area %)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 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.