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

Shuichi Hashimoto, Ken Uehara, Kazuhiro Sogawa, Mamiko Takada, Hiroshi Fukumura

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We measured the fluorescence decays and spectra of perylene adsorbed from solution into zeolite X crystals of 2-3 μm 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.

Original languageEnglish
Pages (from-to)1451-1458
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume8
Issue number12
DOIs
Publication statusPublished - 2006 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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