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• W2017669689 endingPage "318" @default.
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• W2017669689 abstract "Self-assembly of fluorescein (Fl) and rhodamine B (RhB) dyes at the galleries of surfactant impregnated α-zirconium phosphate (SAZrP) is demonstrated here. Cationic surfactants, cetyltrimethylammonium bromide and didodecyldimethylammonium bromide solubilize the hydrophobic dyes in aqueous solutions and enhance their binding to negatively charged α-ZrP. Fl molecules immobilized in SAZrP exhibit distinct spectroscopic signatures with 14 nm red-shifted absorption (λmax at 501 nm vs 487 nm in aqueous solutions) and hyperchromicity (εmax=100,000 M−1 cm−1, twice the value in aqueous or micellar solutions). RhB, in contrast, retains the spectroscopic features as those observed in aqueous solutions (λmax at 553 nm). Enhanced relative quantum yields for the SAZrP bound dyes as compared to aqueous solutions are observed (φrel values of 1.7 and 1.32 for Fl/CAZrP and RhB/CAZrP respectively). Facile binding of Fl molecules with SAZrP was used to investigate the energy transfer between co-immobilized Fl (donor) and RhB (acceptors) molecules. Quenching of Fl fluorescence by RhB, immobilized on SAZrP was efficient and Stern–Volmer quenching constants (KSV) on the order of 106 M−1. Energy transfer efficiencies are enhanced an order of magnitude when compared to solution phase values. Fluorescence polarization of the Fl/SAZrP assemblies at varying Fl concentrations indicated depolarization of the emission at high loadings. Quenching rate constants increased with the dye loading and fluorescence lifetimes decreased due to self-quenching (τ=3.75 ns (monoexponential), low loading vs τ1=0.44 ns (69%, biexponential), high loading). Donor to donor energy migration is possible within these assemblies. Accelerated energy transfer of the immobilized dyes will be useful in the design of artificial light harvesting complexes and photon antennas." @default.
• W2017669689 created "2016-06-24" @default.
• W2017669689 creator A5009529198 @default.
• W2017669689 creator A5087976536 @default.
• W2017669689 date "2000-12-01" @default.
• W2017669689 modified "2023-09-25" @default.
• W2017669689 title "Probing the donor and acceptor dye assemblies at the galleries of α-zirconium phosphate" @default.
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• W2017669689 doi "https://doi.org/10.1016/s1387-1811(00)00307-3" @default.
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