Description
NIR-775 heptamethine cyanine tosylate is a near-infrared polymethine dye identified by CAS number 205744-92-9 and the empirical formula C₃₉H₄₃ClN₂O₃S. With a molar mass of 655,30 g/mol and EG number 812-296-6, it exhibits an absorption maximum of 775 nm in methanol, making it suitable for NIR optical and spectroscopic applications. The product is Heptamethine cyanine tosylate dyes of this type support absorption studies, imaging-related dye chemistry, and analytical workflows that need a defined near-infrared band. It is available from manufacturer Carl ROTH as part of the polymethine dye portfolio used in analytical and materials research. The characterised chromophore enables reproducible methanol-based measurements at 775 nm, while the compact pack size aids controlled dosing. NIR-775 is aimed at researchers requiring a documented NIR cyanine reagent for photochemistry, optical sensing, and related laboratory protocols built around polymethine dyes.
This article is part of Fluorescent dyes & labels, in Dyes, stains & indicators.
Key features
- CAS number: 205744-92-9
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 812-296-6
- Empirical formula: C₃₉H₄₃ClN₂O₃S
- Molar mass: 655,30 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
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Hazard Statements (H-Phrases)
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Questions about S 0253 - FEW Chemicals, 775 nm in MeOH, 1 g, glass
What is this article?
S 0253 - FEW Chemicals, 775 nm in MeOH, 1 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Fluorescent dyes & labels, inside Dyes, stains & indicators, in Lab chemicals.
A fluorescent dye absorbs at one wavelength and emits at a longer one. As a label it is attached to a protein, a nucleic acid or a cell. Excitation and emission maxima, and the reactive group if it must conjugate, are the specification. The colour name does not tell you the wavelengths.
A dye or a stain binds, or changes colour, so that something invisible becomes visible. An indicator changes at a pH or a redox point. A fluorescent dye absorbs one wavelength and emits another, which is how a microscope or a plate reader picks it out. The excitation and emission, or the transition interval, are the specification. The colour name on the label is not. Structures are on PubChem under IUPAC names. Methods are in the PubMed literature.
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