Description
VIS-740 heptamethine cyanine iodide is a polymethine dye with CAS number 19764-96-6 and empirical formula C₂₉H₃₃IN₂. It shows an absorption maximum of 740 nm in methanol and a molar mass of 536,50 g/mol, giving a clearly defined chromophore for laboratory dye work. The material is As an iodide salt, it is intended for solution-phase handling in organic media such as methanol, where the stated absorption maximum can be verified directly. Within the broader group of dyes and pigments, this heptamethine structure supports research and routine laboratory use focused on polymethine chromophores. Physical identity data—CAS registry number, EG number 243-282-2, molar mass and formula—are provided to aid documentation and inventory control. The dye is available from manufacturer Carl ROTH for laboratories that require a VIS-740 cyanine iodide in a compact glass pack for optical and chemical applications.
This article is part of Fluorescent dyes & labels, in Dyes, stains & indicators.
Key features
- CAS number: 19764-96-6
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 243-282-2
- Empirical formula: C₂₉H₃₃IN₂
- Molar mass: 536,50 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
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Questions about S 2364 - FEW Chemicals, 740 nm in MeOH, 1 g, glass
What is this article?
S 2364 - FEW Chemicals, 740 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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