Description
VIS-643 pentamethine cyanine PF6- is a visible-range polymethine dye supplied as the hexafluorophosphate salt. It is identified by CAS number 462093-29-4, empirical formula C₃₃H₄₃F₆N₂P and molar mass 612,68 g/mol. The absorption maximum in methanol is 643 nm, positioning the dye in the red visible window commonly used for fluorescence labelling, microscopy and optical assays. Pentamethine cyanines are valued for intense absorption and versatile conjugation chemistry within the broader polymethine dye family. This grade comes from manufacturer Carl ROTH and is intended for research applications in dyes and pigments. Clear spectroscopic and molecular data help laboratories integrate the dye reliably into imaging probes, sensors and photometric standards.
This article is part of Photometers & spectrophotometers, in Spectroscopy & photometry.
Key features
- CAS number: 462093-29-4
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 812-699-7
- Empirical formula: C₃₃H₄₃F₆N₂P
- Molar mass: 612,68 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
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Questions about S 2046 - FEW Chemicals, 643 nm in MeOH, 1 g, glass
What is this article?
S 2046 - FEW Chemicals, 643 nm in MeOH, 1 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Photometers & spectrophotometers, inside Spectroscopy & photometry, in Lab instruments.
A photometer reads absorbance at one or a few wavelengths. A spectrophotometer scans or selects many. Both send light through a cuvette or a well. The wavelength range, UV or visible, and the bandwidth decide what can be measured. A visible-only instrument cannot read a nucleic acid at 260 nm.
A photometer or spectrophotometer sends light through a sample and reads how much was absorbed. In the range where the Beer–Lambert relation holds, absorbance tracks concentration. A refractometer reads how a liquid bends light, which tracks dissolved solids. A polarimeter reads the rotation of polarised light, the classical measurement for sugars. The lamp, the wavelength and the cuvette path length are the three things that have to be right before the number means anything. The optical quantities trace to NIST and the BIPM.
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The category is Spectroscopy & photometry. The sub-category is Photometers & spectrophotometers. The catalogue is Lab instruments.
Shelves beside this one are Refractometers & polarimeters and Lamps, cuvette holders & accessories.
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