Journal of Sol-Gel Science and Technology

, Volume 1, Issue 1, pp 85–92

Synthesis and spectroscopy of tpps-doped silica gels by the sol-gel process

  • Kazutaka Kamitani
  • Motohiro Uo
  • Hiroyuki Inoue
  • Akio Makishima
Article

Abstract

Tetraphenylporphinetetrasulfonic acid (TPPS), which is well known as a photochemical hole-burning (PHB) dye, was incorporated in silica gels obtained by the sol-gel process from tetramethoxysilane (TMOS). The form of TPPS must be free base (H2P), which exists in basic condition, to be active in PHB. To obtain transparent and higher density silica gels doped with free-base TPPS, two-step hydrolysis processes using solutions containing NaOH were developed, and the gels having bulk density of about 1.5 g/cm3 were synthesized. The form of TPPS in the gels was investigated by measuring the absorption and luminescence spectra, and it was found that in the silica gels almost all the TPPS retained free-base form at the molar ratio of NaOH/TMOS above 10−3.

Key words

Free-base TPPS silica gels NaOH monocation spectroscopy 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • Kazutaka Kamitani
    • 1
  • Motohiro Uo
    • 1
  • Hiroyuki Inoue
    • 1
  • Akio Makishima
    • 1
  1. 1.Department of Materials Science, Faculty of EngineeringUniversity of TokyoTokyoJapan

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