Description
VIS-644 pentamethine cyanine PF6- is a polymethine dye presenting an absorption maximum of 644 nm in methanol. Identified by CAS number 462093-30-7 and EG nr. 812-700-0, the compound has the empirical formula C₃₃H₄₂ClF₆N₂P and a molar mass of 647,13 g/mol. The pentamethine cyanine structure with PF6- counter-ion supports work that requires a defined visible absorption band near 644 nm. Analytical and materials science groups can incorporate the dye into calibration routines, comparative polymethine evaluations, or solution preparation for spectral analysis. This product from manufacturer Carl ROTH arrives in compact glass packaging suited to controlled laboratory handling and small-scale experimental use. Clear molecular weight, formula, and absorption data facilitate documentation, quality checks, and reproducible working solutions. Researchers focusing on polymethine chromophores, sensor chemistry, or educational spectroscopy will find the specified 644 nm maximum and structural details useful when planning protocols that demand a VIS-range cyanine dye in gram-scale quantities.
This article is part of Photometers & spectrophotometers, in Spectroscopy & photometry.
Key features
- CAS number: 462093-30-7
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 812-700-0
- Empirical formula: C₃₃H₄₂ClF₆N₂P
- Molar mass: 647,13 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
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Questions about S 2053 - FEW Chemicals, 644 nm in MeOH, 1 g, glass
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S 2053 - FEW Chemicals, 644 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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