Description
VIS-747 heptamethine cyanine PF6- is a polymethine dye showing an absorption maximum of 747 nm in methanol. It is identified by CAS number 134339-08-5 and EG nr. 811-808-5, with empirical formula C₃₅H₄₅F₆N₂P and molar mass 638,72 g/mol. The heptamethine cyanine framework with PF6- counter-ion offers a defined absorption band around 747 nm that is useful for optical studies, method calibration, and comparative chromophore work. Research groups can employ the material when preparing solutions for spectral analysis or when screening polymethine structures in the visible range. This dye from manufacturer Carl ROTH is delivered in compact glass packaging appropriate for controlled handling in analytical and materials laboratories. Documented CAS number, EG number, formula, and molar mass support accurate record-keeping and protocol design. Applications span chemicals research, educational spectroscopy, and development tasks that rely on a well-characterised VIS-range heptamethine cyanine supplied in convenient gram quantities for reproducible experimental practice and documentation.
This article is part of Photometers & spectrophotometers, in Spectroscopy & photometry.
Key features
- CAS number: 134339-08-5
- Pack sizes: 1 g, 5 g, 10 g
- EG nr.: 811-808-5
- Empirical formula: C₃₅H₄₅F₆N₂P
- Molar mass: 638,72 g/mol
- Absorption maximum (MeOH): 747 nm
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
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Questions about S 2137 - FEW Chemicals, 747 nm in MeOH, 1 g, glass
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S 2137 - FEW Chemicals, 747 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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