Description
Coumarin VIS-423 Diethylamino Thiophene is a coumarin dye with the empirical formula C₁₇H₁₇NO₂S, CAS number 117850-52-9 and a molar mass of 299,39 g/mol. In methanol it shows an absorption maximum at 423 nm, making it suitable for visible-range spectroscopic and dye chemistry work. The material is identified under EG nr. 811-805-9 Physical and identity data from manufacturer Carl ROTH support its use in research settings where defined absorption behaviour and a clear molecular composition are required. Typical applications include optical characterisation, method development and comparative studies of coumarin-based chromophores. Clear CAS, EG and formula identifiers help laboratories document reagents consistently in notebooks, SOPs and purchasing records for visible-light dye and sensor research.
This article is part of Fluorescent dyes & labels, in Dyes, stains & indicators.
Key features
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about Coumarin VIS-423 Diethylamino Thiophene, Absorption maximum (MeOH) = 423 nm, 1 g
What is this article?
Coumarin VIS-423 Diethylamino Thiophene, Absorption maximum (MeOH) = 423 nm, 1 g 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.
Which category should I open next?
The category is Dyes, stains & indicators. The sub-category is Fluorescent dyes & labels. The catalogue is Lab chemicals.
Shelves beside this one are Microscopy stains & staining solutions and Dyes & pigments.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.

