On the efficiency of the photosensitized production of singlet oxygen in water suspensions of a tris(bipyridyl)ruthenium(II) complex covalently bound to an insoluble hydrophilic polymer

J. L. Bourdelande, J. Font, G. Marques, A. A. Abdel-Shafi, F. Wilkinson, D. R. Worrall

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25 Citations (Scopus)

Abstract

It is shown that molecular oxygen in D2O is efficient in deactivating the lowest excited state of an insoluble hydrophilic polymeric equivalent of [Ru(bpy)3]2+ (see structure 1). The rate constant for quenching by molecular oxygen of the lowest excited triplet charge transfer state of 1 in D2O saturated gel is found to be 4.4±0.5×108M-1s-1. Singlet molecular oxygen, which is characterized by its emission at 1270nm, is generated during quenching and decays with a lifetime of 18±3μs. The lifetimes for the decay of singlet oxygen, when it is generated by exciting D2O-solved sensitizers in the presence and absence of the unfunctionalized polymeric skeleton in the form of a D2O saturated gel, are 34±3 and 63±5μs, respectively. These shorter lifetimes for singlet oxygen in the polymeric gels are consistent with quenching of singlet oxygen by the hydroxyl groups present in the polymer. © 2001 Elsevier Science B.V.
Original languageEnglish
Pages (from-to)65-68
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume138
Issue number1
DOIs
Publication statusPublished - 1 Jan 2001

Keywords

  • Heterophase
  • Hydrophilic polymer
  • Singlet oxygen sensitization
  • Tris(bipyridyl)ruthenium(II) complex

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