Description

5-Chloro-2-[2-[(5-Chloro-3-Ethyl-3H-Benzothiazol-2-Ylidene)Methyl]But-1-Enyl]-3-(3-Sulphonatobutyl)Benzothiazolium is a specialized benzothiazolium dye intermediate with a sulfonate functional group, imparting water solubility and anionic character. This compound is valued for its role in the synthesis of near-infrared (NIR) absorbing dyes and functional colorants used in advanced optical applications. It is primarily sought by manufacturers in the imaging, security printing, and optical data storage industries, where precise light absorption properties are critical.

Application

• NIR-Absorbing Dye Synthesis: A key precursor for creating dyes that absorb in the near-infrared spectrum for laser marking and optical filters.
• Security Inks and Printing: Used in the formulation of covert security inks for banknotes, documents, and brand protection, detectable only with specific equipment.
• Optical Data Storage Media: A component in the development of recording layers for writable optical discs and other data storage technologies.
• Photodynamic Therapy (PDT) Research: Investigated as a potential photosensitizer precursor in medical research for targeted light-activated therapies.
• Functional Polymer Additive: Incorporated into polymers to impart specific light-absorption or charge-transfer properties for specialty films and coatings.
• Analytical Chemistry Reagent: Serves as a chromogenic agent or probe in spectroscopic analysis and sensor development.

Basic Information

Product Name	5-Chloro-2-[2-[(5-Chloro-3-Ethyl-3H-Benzothiazol-2-Ylidene)Methyl]But-1-Enyl]-3-(3-Sulphonatobutyl)Benzothiazolium
CAS No.	18426-55-6
Molecular Formula	C24H25Cl2N2O3S2- (Anion)
Molecular Weight	524.50 g/mol (Free acid form)
Synonyms	NK-2016; Benzothiazolium, 5-chloro-2-[2-[(5-chloro-3-ethyl-2(3H)-benzothiazolylidene)methyl]-1-butenyl]-3-(3-sulfobutyl)-, inner salt; 5-Chloro-2-[2-[(5-chloro-3-ethyl-2(3H)-benzothiazolylidene)methyl]-1-butenyl]-3-(3-sulfobutyl)benzothiazolium hydroxide, inner salt; NIR Dye Intermediate 18426-55-6; Sulfoalkylated Benzothiazolium Dye; Anionic Cyanine Dye Intermediate
EINECS	Contact for details

Quality Control

Our production of this advanced intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical techniques including HPLC, NMR, and mass spectrometry. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting identity, purity, and relevant spectroscopic data to support your R&D and manufacturing processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). The product is light-sensitive; prolonged exposure to light should be avoided to maintain stability.

Specification

Item	Specification
Appearance	Dark green to blue-black powder or crystals
Identification (IR)	Conforms to reference spectrum
Identification (HPLC)	Retention time corresponds to reference standard
Purity (HPLC)	≥ 95.0% (Area %)
Water Content (KF)	≤ 2.0%
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.