Description
VIS-556 Trimethine-Thiacyanine Iodide is a polymethine dye provided as the thiacyanine iodide salt for visible-range optical applications. Identified by CAS number 905-97-5, it has the empirical formula C₂₁H₂₁IN₂S₂ and a molar mass of 492,44 g/mol. Measured in methanol, the absorption maximum lies at 556 nm, making the dye suitable for work in the green-yellow portion of the visible spectrum. The compound is Spectral and compositional data from manufacturer Carl ROTH allow straightforward integration into laboratory workflows involving trimethine cyanines. Typical uses include spectroscopic characterisation, method development and comparative studies of polymethine chromophores where a defined absorption wavelength and iodide counter-ion are required.
This article is part of Fluorescent dyes & labels, in Dyes, stains & indicators.
Key features
- CAS number: 905-97-5
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 620-696-5
- Empirical formula: C₂₁H₂₁IN₂S₂
- Molar mass: 492,44 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
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Questions about VIS-556 Trimethine-, Thiacyanine Iodide, 1 g, glass
What is this article?
VIS-556 Trimethine-, Thiacyanine Iodide, 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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