Description
Squaraine VIS-640 is a squaraine dye described as bis(diethylamino-hydroxyphenyl), with CAS number 68842-66-0 and EG number 812-703-7. The empirical formula is C₂₄H₂₈N₂O₄ and the molar mass is 408,50 g/mol. In methanol (MeOH) the absorption maximum is 640 nm. This reagent is CAS and EG identifiers, together with the complete empirical formula, support unambiguous registration in chemical inventories and associated documentation. Squaraine VIS-640 forms part of the range of specialised organic dyes selected when a visible absorption maximum of 640 nm in methanol is required. enables precise weighing and preparation of solutions for experimental use. Laboratories engaged with dyes and pigments can specify this product on the basis of its bis(diethylamino-hydroxyphenyl) structure and the listed molecular and optical data. Molar mass, formula and absorption wavelength provide a clear reference for comparison with related squaraine materials in method setup.
This article belongs on Fluorescent dyes & labels, in Dyes, stains & indicators.
Key features
- CAS number: 68842-66-0
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 812-703-7
- Empirical formula: C₂₄H₂₈N₂O₄
- Molar mass: 408,50 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 2087 - FEW Chemicals, 640 nm in MeOH, 1 g, glass
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S 2087 - FEW Chemicals, 640 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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