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Cyanine dyes as ratiometric fluorescence standards for the far-red spectral region

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Abstract

Most quantitative fluorescence measurements report emission quantum yields by referring the integrated fluorescence profile to that of a well-known standard compound measured under carefully controlled conditions. This simple protocol works well provided an appropriate standard fluorophore is available and that the experimental conditions used for reference and unknown are closely comparable. Commercial fluorescence spectrophotometers tend to perform very well at wavelengths between 250 and 650 nm but are less responsive at longer wavelengths. There are no recognized emission standards for the far-red region. We now report fluorescence quantum yields for a series of commercially available cyanine dyes in methanol solution at room temperature. The compounds are selected to span the wavelength region from 600 to 850 nm, with absolute emission quantum yields being determined by thermal blooming spectrometry. Calibration of the instrument is made by reference to aluminium(III) phthalocyanine tetrasulfonate and aza-BODIPY in methanol.

Graphical abstract: Cyanine dyes as ratiometric fluorescence standards for the far-red spectral region

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Publication details

The article was received on 05 Sep 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7PP00333A
Citation: Photochem. Photobiol. Sci., 2018, Advance Article
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    Cyanine dyes as ratiometric fluorescence standards for the far-red spectral region

    J. K. G. Karlsson, O. J. Woodford, H. Mustroph and A. Harriman, Photochem. Photobiol. Sci., 2018, Advance Article , DOI: 10.1039/C7PP00333A

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