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Cy5 Dye Cassettes Exhibit Through-Bond Energy Transfer and Enable Ratiometric Fluorescence Sensing
Zhumin Zhang ; Jordan L. Chasteen ; Bradley D. Smith JOC,2024,89(5):3309-3318. DOI: 10.1021/acs.joc.3c02767
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Abstract: The chemosensor literature contains many reports of fluorescence sensing using polyaromatic hydrocarbon fluorophores such as pyrene, tetraphenylethylene, or polyaryl(ethynylene), where the fluorophore is excited with ultraviolet light (<400 nm) and emits in the visible region of 400–500 nm. There is a need for general methods that convert these “turn-on” hydrocarbon fluorescent sensors into ratiometric sensing paradigms. One simple strategy is to mix the responsive hydrocarbon sensor with a second non-responsive dye that is excited by ultraviolet light but emits at a distinctly longer wavelength and thus acts as a reference signal. Five new cyanine dye cassettes were created by covalently attaching a pyrene, tetraphenylethylene, or biphenyl(ethynylene) component as the ultraviolet-absorbing energy donor directly to the pentamethine chain of a deep-red cyanine (Cy5) energy acceptor. Fluorescence emission studies showed that these Cy5-cassettes exhibited large pseudo-Stokes shifts and high through-bond energy transfer efficiencies upon excitation with ultraviolet light. Practical potential was demonstrated with two examples of ratiometric fluorescence sensing using a single ultraviolet excitation wavelength. One example mixed a Cy5-cassette with a pyrene-based fluorescent indicator that responded to changes in Cu2+ concentration, and the other example mixed a Cy5-cassette with the fluorescent pH sensing dye, pyranine.
Purchased from AmBeed: 1227040-87-0 ; 54136-26-4 ; 1195975-05-3 ; 534-17-8 ; 29079-00-3 ; 13965-03-2 ; 3375-31-3 ; 7681-65-4 ; 63149-24-6 ; 64285-36-5
CAS No. : | 63149-24-6 | MDL No. : | MFCD02690163 |
Formula : | C19H23NO3S | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | GJCURKVOCXJAIV-UHFFFAOYSA-N |
M.W : | 345.46 | Pubchem ID : | 113092 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P301+P312-P302+P352-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |