Photochemistry of charge-transfer complexes in a viologen periodic mesoporous organosilica: Time evolution from femtoseconds to minutes

Mercedes Álvaro, Belén Ferrer, Hermenegildo García*, Shuichi Hashimoto, Masahiro Hiratsuka, Tsuyoshi Asahi, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Persistent radical cations can be generated in V ∝ PMO, a periodic mesoporous organosilica incorporating a viologen in its silicate framework. Photoexcitation of V ∝ PMO forms a geminate viologen-halide ion pair that can undergo rapid charge recombination or electron hopping to form the nongeminate ion pair, which persists for minutes (see picture). In contrast, viologen-halide CT complexes in solution undergo complete charge recombination on the sub-nanosecond timescale.

Original languageEnglish
Pages (from-to)1058-1062
Number of pages5
JournalChemPhysChem
Volume5
Issue number7
DOIs
StatePublished - 19 Jul 2004

Keywords

  • Charge transfer
  • Mesoporous materials
  • Photochemistry
  • Radical ions
  • Viologens

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