Application of time- and space-resolved fluorescence spectroscopy to the distribution of guest species into micrometer-sized zeolite crystals

Physical Chemistry Chemical Physics : PCCP
Shuichi HashimotoHiroshi Fukumura

Abstract

We measured the fluorescence decays and spectra of perylene adsorbed from solution into zeolite X crystals of 2-3 microm in diameter at the level of individual crystals by the application of a microscopy method coupled with a single photon counting apparatus and a multichannel spectrophotometer. We found that both decays and spectra are particle-dependent, i.e. a particle-to-particle difference was observed for the fluorescence decay curves at a fixed loading level along with a particle-dependent spectral change due to the various contribution of excimer emission band relative to those of three monomers. These findings are due to a non-homogeneous distribution which is confirmed by the various emission intensities of perylene-loaded zeolite crystals observed by fluorescence microscopy. Previously, a homogeneous distribution of the guest between zeolite crystals has been just taken for granted and not justified by experiment. The present result suggests that commonly employed collective measurements such as UV-VIS absorption and emission spectroscopies, IR and Raman spectroscopies, and NMR of bulk zeolite powders provide only averaged results and may sometimes suffer from acquiring precise molecular level pictures.

References

Oct 20, 2000·Chemistry : a European Journal·M PauchardG Calzaferri
Jan 15, 2004·Journal of the American Chemical Society·Hyun Sung KimKyung Byung Yoon
Nov 13, 2004·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Shuichi Hashimoto, Shinji Yamashita
Jul 21, 2006·The Journal of Physical Chemistry. B·Yanghee KimPrabir K Dutta

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Citations

Oct 19, 2006·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Nobuyuki TairaKyung Byung Yoon
Feb 22, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Gion CalzaferriAndreas Kunzmann
Dec 17, 2008·Physical Chemistry Chemical Physics : PCCP·Fangmao YeDaniel A Higgins
Jul 30, 2008·Journal of the American Chemical Society·Michael BusbyLuisa De Cola

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