title: Fluorescence-on response via CB7 binding to viologen-dye pseudorotaxanes.
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 cucurbit[7]uril (CB7). Dyads of benzyl viologen-rhodamine B or a BODIPY fluorophore gave upon CB7 complexation 14- and 30-fold fluorescence enhancement, respectively.
authors.affiliation: Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States.
authors.forename: Anuradha
authors.initials: A
authors.lastname: Singh
authors.forename: Wai-Tak
authors.initials: WT
authors.lastname: Yip
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Halterman
mesh_terms: D001896:Boron Compounds / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry; D015394:Molecular Structure; D055668:Photochemical Processes; D012235:Rhodamines; D043862:Rotaxanes / Q000737:chemistry*; D014755:Viologens / Q000737:chemistry*
chemical_list: C095489:4,4-difluoro-4-bora-3a,4a-diaza-s-indacene; D001896:Boron Compounds; D005456:Fluorescent Dyes; D012235:Rhodamines; D043862:Rotaxanes; D014755:Viologens; C029773:rhodamine B