Description

2-[(1-Ethyl-2(1H)-Quinolylidene)Methyl]-1-(3-Sulfopropyl) Quinolinium,Inner Salt is a specialized zwitterionic cyanine dye intermediate with unique photophysical properties. This compound matters for its role as a key precursor in synthesizing near-infrared (NIR) fluorescent dyes and labels used in advanced diagnostic and imaging applications. It is primarily needed by manufacturers in the biotechnology, pharmaceutical, and analytical chemistry sectors for developing sensitive detection reagents and probes.

Application

• Synthesis of NIR Fluorescent Dyes: Serves as a critical building block for creating cyanine dyes with absorption and emission in the near-infrared region.
• Bioconjugation & Labeling: Used to produce reactive derivatives for labeling proteins, antibodies, and nucleic acids in bioassays.
• In Vivo Imaging Probes: A precursor for developing contrast agents and probes used in fluorescence-guided surgery and preclinical research.
• Diagnostic Reagents: Integral to the manufacture of reagents for clinical diagnostics, including immunoassays and flow cytometry.
• Photodynamic Therapy (PDT) Research: Investigated as a component in the development of photosensitizers for targeted cancer therapies.
• Material Science: Applied in the research of organic semiconductors and light-harvesting materials due to its conjugated structure.

Basic Information

Product Name	2-[(1-Ethyl-2(1H)-Quinolylidene)Methyl]-1-(3-Sulfopropyl) Quinolinium,Inner Salt
CAS No.	53440-14-5
Molecular Formula	C24H24N2O3S
Molecular Weight	420.52 g/mol
Synonyms	1-(3-Sulfopropyl)-2-[(1-ethyl-2(1H)-quinolylidene)methyl]quinolinium, inner salt; Quinolinium, 1-(3-sulfopropyl)-2-[(1-ethyl-2(1H)-quinolylidene)methyl]-, inner salt; CY3.5 carboxylic acid precursor; Sulfo-Cyanine3.5 intermediate; 2-[2-(1-Ethyl-1H-quinolin-1-ium-2-yl)vinyl]-1-(3-sulfopropyl)quinolin-1-ium; Inner salt of 2-[(1-Ethyl-2(1H)-quinolylidene)methyl]-1-(3-sulfopropyl)quinolinium
EINECS	Contact for details

Quality Control

Our 2-[(1-Ethyl-2(1H)-Quinolylidene)Methyl]-1-(3-Sulfopropyl) Quinolinium,Inner Salt is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for sensitive research and manufacturing applications. Certificates of Analysis (COA) with detailed chromatographic data are provided to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept sealed in a desiccated environment away from direct light exposure to maintain stability and prevent degradation.

Specification

Item	Specification
Appearance	Dark green to purple crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 3.0%
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.