Synthesis and photophysical properties of heptamethine cyanine–fullerene C60 dyads with non-quenched fluorescence

Mendeleev Communications(2021)

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Abstract
Two new heptamethine cyanine dye–fullerene C60 covalently- linked dyads, which absorb in far-red and NIR spectral regions, have been synthesized by esterification click reaction and characterized by physicochemical methods. No significant fluorescence quenching was found due to weak electronic coupling between heptamethine moiety and fullerene core, which was confirmed by photophysical and electrochemical methods. Such dyads can be useful for cell imaging and fluorescence diagnostics of various fullerene derivatives.
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Key words
fullerene C60,fullerene derivatives,heptamethine compounds,cyanine dyes,dyads,fluorescence,NIR absorbance
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