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- W1979744054 abstract "A surface-bound polymer, poly(2-vinylnaphthalene-alt-methacrylic acid)(P(2VN-alt-MA)), was used to sensitize a surface-bound chromophore, pyrenebutyric acid (PBA), when the surface was zeolite-Y. Two solvent systems were used, tetrahydrofuran and methanol. Adsorption experiments of PBA on zeolite suggested that PBA absorbed into the bulk as well as the outer surface of the zeolite. Steady-state fluorescence spectra showed little or no excimer formation when pyrenebutyric acid was absorbed onto zeolite at low loadings, while the polymer exhibited some naphthalene excimer, especially in the non-solvent methanol. When both P(2VN-alt-MA) and PBA were adsorbed on the same surface, four fluorescence components were observed: naphthalene monomer and excimer, PBA monomer, and background fluorescence from the zeolite. While it is not possible to determine the quantum yields of the surface-bound species, a multiparameter minimization program was used to deduce the relative contribution of each component to the fluorescence spectra. A similar procedure was used to deconvolute the excitation spectra. The fluorescence of PBA, excited at 285 nm, was enhanced by a factor of 2–6 in the presence of the polymer relative to directly excited PBA. The quantum efficiency of PBA sensitization (x) was estimated using the deconvuluted fluorescence and excitation spectra. The most efficient sensitization (x = 0.41) was observed with zeo/poly-/ PBA/CH3OH, where the polymer was adsorbed before the PBA. Lifetime and quenching studies of PBA by nitromethane indicated that PBA is quenched at about the same rate for all samples. The choice of solvent affected the appearance of the fluorescence spectra, but did not systematically affect the enhancement factors or the quantum efficiencies. The order of addition of the polymer and PBA to the zeolite strongly affected the photophysics of the system." @default.
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- W1979744054 date "1989-05-01" @default.
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- W1979744054 title "Photon harvesting by surface-bound polymers: Poly(2-vinylnaphthalene-alt-methacrylic acid) sensitization of pyrenebutyric acid on zeolite" @default.
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- W1979744054 doi "https://doi.org/10.1016/0022-2313(89)90011-2" @default.
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