Description

2,5-Bis[(E)-2-(1,3,3-Trimethyl-1,3-Dihydro-2H-Indol-2-Ylidene)Ethylidene]Cyclopentanone is a high-purity, functional organic dye intermediate belonging to the cyanine dye family. This compound is valued for its strong light absorption and fluorescence properties, making it a critical component in advanced optical applications. It is primarily sought by manufacturers in the optical data storage, laser technology, photodynamic therapy, and non-linear optical material sectors.

Application

• Optical Data Storage Media: A key chromophore for recordable (R) and rewritable (RW) optical discs (e.g., CD-R, DVD±R).
• Laser Dyes & Optical Filters: Used in the formulation of tunable dye lasers and as an absorber in protective optical filters.
• Photodynamic Therapy (PDT): Investigated as a potential photosensitizer for targeted cancer treatments.
• Non-Linear Optical (NLO) Materials: A building block for materials used in frequency doubling, optical switching, and signal processing.
• Solar Energy & Photovoltaics: Research component in dye-sensitized solar cells (DSSCs) and organic photovoltaics (OPVs).
• Biomedical Imaging & Sensing: Utilized as a fluorescent probe or tag in bioanalytical assays and imaging techniques.

Basic Information

Product Name	2,5-Bis[(E)-2-(1,3,3-Trimethyl-1,3-Dihydro-2H-Indol-2-Ylidene)Ethylidene]Cyclopentanone
CAS No.	27713-85-5
Molecular Formula	C31H34N2O
Molecular Weight	450.62 g/mol
Synonyms	2,5-Bis[(E)-2-(1,3,3-trimethylindolin-2-ylidene)ethylidene]cyclopentanone; Dicyclopentanone Cyanine Dye; IR-125 Dye; Cryptocyanine; 1,3,3-Trimethyl-2-[(1E,3E,5E)-5-(1,3,3-trimethylindolin-2-ylidene)penta-1,3-dien-1-yl]-3H-indol-1-ium; Heptamethine Cyanine Dye; NK-125; Cryptocyanine Dye
EINECS	Contact for details

Quality Control

Our production of this cyanine dye intermediate adheres to strict quality protocols to ensure batch-to-batch consistency and performance reliability for sensitive optical applications. Each lot is characterized by advanced analytical techniques including HPLC, NMR, and UV-Vis spectroscopy. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and key spectral properties is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at room temperature (15-25°C) under an inert atmosphere (e.g., nitrogen or argon) to prevent oxidation. Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	Dark green to blue-black crystalline powder
Identification (IR)	Conforms to structure
Identification (UV-Vis)	Conforms (λmax ~785 nm in methanol)
Purity (HPLC)	≥ 98.0% (Area %)
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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