Fluorescence-On Response via CB7 Binding to Viologen-Dye Pseudorotaxanes |
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Authors: | Anuradha Singh Wai-Tak Yip Ronald L Halterman |
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Institution: | Department of Chemistry and Biochemistry, University of Oklahoma , Norman, Oklahoma 73019, United States. |
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Abstract: | Fluorescence-on sensors typically rely on disrupting photoinduced electron transfer quenching of the excited state through binding the electron donor. To provide a more general fluorescence-on signaling unit, a quencher-fluorophore dyad has been developed in which quenching by electron transfer to a tethered viologen acceptor can be disrupted through complexation of the viologen by cucurbit7]uril (CB7). Dyads of benzyl viologen-rhodamine B or a BODIPY fluorophore gave upon CB7 complexation 14- and 30-fold fluorescence enhancement, respectively. |
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