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Research on Chemical Intermediates

, Volume 39, Issue 1, pp 269–278 | Cite as

Investigation of adsorption behavior and energy transfer of cationic porphyrins on clay surface at low loading levels by picosecond time-resolved fluorescence measurement

  • Tetsuya Shimada
  • Satoshi Hamatani
  • Shingo Onodera
  • Yohei Ishida
  • Haruo Inoue
  • Shinsuke Takagi
Article

Abstract

Time-resolved fluorescence and steady-state spectroscopic measurements were performed with +4-charged cationic porphyrins adsorbed on an anionic-type clay (Sumecton SA; SSA) surface at a low molecular loading level (10 % vs. cation-exchange capacity of clay) corresponding to an occupied area of ca 50 nm2 per molecule. Absorption spectra indicated no interaction between transition moments of the porphyrins on the clay surface. An efficient energy-transfer process from donor to acceptor porphyrin was observed on the clay surface even under low porphyrin loading conditions. The efficiency of energy transfer obtained from the steady-state measurement was 65 %. Real-time behavior of the porphyrins was successfully captured during energy transfer. The rate constant of the energy transfer obtained from time-resolved fluorescence measurements was found to be 5.3 × 108 s−1. According to the efficiency and the rate constant, it is proposed that the adsorbed porphyrins did not have a uniform and fixed distribution.

Keywords

Energy transfer Porphyrin Clay Hybrid Time-resolved measurement Low loading 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Tetsuya Shimada
    • 1
  • Satoshi Hamatani
    • 1
  • Shingo Onodera
    • 1
  • Yohei Ishida
    • 1
    • 2
  • Haruo Inoue
    • 1
  • Shinsuke Takagi
    • 1
    • 3
  1. 1.Department of Applied Chemistry, Graduate Course of Urban Environmental SciencesTokyo Metropolitan UniversityHachiohjiJapan
  2. 2.Japan Society for the Promotion of Science (DC1)Ichibancho, Chiyoda-kuJapan
  3. 3.PRESTO (Precursory Research for Embryonic Science and Technology)Japan Science and Technology AgencyKawaguchiJapan

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