CIDEP from a polarized ketone triplet state incarcerated within a nanocapsule to a nitroxide in the bulk aqueous solution

Steffen Jockusch, Mintu Porel, V. Ramamurthy, Nicholas J. Turro

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Thioxanthone and benzil derivatives were incarcerated into an octa acid nanocapsule. Photoexcitation of these ketones generated electronic triplet excited states, which become efficiently quenched by positively charged nitroxides adsorbed outside on the external surface of the negatively charged nanocapsule. Although the triplet excited ketone and quencher are separated by a molecular wall (nanocapsule), quenching occurs on the nanosecond time scale and generates spin-polarized nitroxides, which were observed by time-resolved EPR spectroscopy. Because opposite signs of spin polarization of nitroxides were observed for thioxanthone and benzil derivatives, it is proposed that the electron spin polarization transfer mechanism of spin-polarized triplet states to nitroxides is the major mechanism of generating nitroxide polarization.

Original languageEnglish (US)
Pages (from-to)2877-2880
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume2
Issue number22
DOIs
StatePublished - Nov 17 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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