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- W2019121337 abstract "A series of polycondensed aromatic N-heterocycles (acridine, benzo-f-quinoline 1,2,7,8-dibenzacridine and 3,4,5,6-dibenzacridine) were adsorbed from the gas phase and from liquid solution on highly dispersed silica gels with very different specific surface areas and pore sizes. The translational mobility of the adsorbed species was quantified by the triplet decay and the delayed fluorescence following bimolecular triplet-triplet annihilation after pulsed laser irradiation. The decay kinetics were analyzed with conventional second order rate equations and with the fractal approach. The first method is reliable without limitations on adsorbents with large pore diameters. It yields second order annihilation constants of 4 times 1012-6 times 1011 dm2 mol−1 s−1 depending on the masses and sterical requirements of the adsorbates. For the second method a spectral dimension ds= 4/3 was used. This method is quantitatively applicable to all heterocycles adsorbed on silica gel 60 that have very small pore sizes. An activation energy of 4.9 ± 0.5 kcal mol−1 was obtained for the translational diffusion of acridine on hydroxylated silica gel." @default.
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- W2019121337 date "1991-10-01" @default.
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- W2019121337 title "TRANSLATIONAL MOBILITY IN THE ADSORBED STATE. BIMOLECULAR DEACTIVATION KINETICS OF LASER-EXCITED AZAAROMATICS ON MICROPOROUS SILICA" @default.
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- W2019121337 doi "https://doi.org/10.1111/j.1751-1097.1991.tb02054.x" @default.
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