Description
Polymethine dye with absorption maximum (MeOH) = 639 nm is a specialised laboratory colourant characterised by the empirical formula C₂₇H₃₀Cl₂N₂ and a molar mass of 453,45 g/mol. This compound falls within the polymethine dyes category and is intended for scientific work that depends on a defined visible-range absorption profile in methanol. The material is Optical laboratories and analytical groups can use the stated 639 nm absorption maximum as a practical benchmark when aligning instruments or evaluating chromophore behaviour under methanolic conditions. Physical handling is supported by compact glass packaging that helps maintain sample integrity during storage and dispensing in controlled research environments. Available from manufacturer Carl ROTH, the dye suits applications across chemicals, dyes and pigments workflows where polymethine structures are investigated. Researchers engaged in sensor chemistry, optical materials characterisation, or teaching demonstrations benefit from a clearly specified absorption maximum that simplifies documentation, spectral matching, and reproducible experimental protocols requiring small quantities of a well-described polymethine colourant.
This article is part of Dyes & pigments, in Dyes, stains & indicators.
Key features
- Pack sizes: 1 g, 5 g, 10 g
- Empirical formula: C₂₇H₃₀Cl₂N₂
- Absorption maximum (MeOH): 639 nm
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
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Questions about Absorption maximum (MeOH) = 639 nm, 1 g, glass
What is this article?
Absorption maximum (MeOH) = 639 nm, 1 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Dyes & pigments, inside Dyes, stains & indicators, in Lab chemicals.
A dye dissolves. A pigment is a particle dispersed in a medium. On this shelf they are the colouring substances used as reagents or as markers, specified by Colour Index name or by structure where it is known. The same common name can hide two constitutions.
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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