Characterization of the inner space of mesostructured silica by time-resolved fluorescence spectroscopy

Akira Yamaguchi, Toshio Kamijo, Norio Teramae

Research output: Contribution to journalArticlepeer-review

Abstract

Time-resolved fluorescence spectroscopy using coumarin dyes as a fluorescent probe provides information on solvation dynamics in the vicinity of the coumarin dyes. In the present study, solvation dynamics occurred inside mesostructured silica with a uniform silica-mesopore diameter was examined by using four kinds of coumarin dyes as a fluorescent probe. In the silica-CTAB nanocomposite composed of CTAB (cetyltrimethylammonium bromide) micelles and silica-mesopores (pore diameter: 3.4 nm), it was found that coumarin dyes with different functional groups were located at different regions and that the molecular motions were differently constrained depending on the location of the coumarin dyes. In the silica-mesopores (pore diameter: 3.1 nm) filled with alcohol solvents, relatively small alcohols (ethanol and butanol) exhibited slow solvent relaxation process due to their confinment in the silica-mesopore, whereas such slow relaxation process was not recognized for large alcohols (hexanol and decanol).

Original languageEnglish
Pages (from-to)507-516
Number of pages10
JournalBunseki Kagaku
Volume58
Issue number6
DOIs
Publication statusPublished - 2009

Keywords

  • Coumarin dyes
  • Mesostructured silica
  • Solvation dynamics
  • Time-resolved fluorescence spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry

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