Journal
CHEMICAL PHYSICS
Volume 301, Issue 1, Pages 27-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2004.02.015
Keywords
photosensitizer; pyropheophorbide alpha; fullerene; photoinduced electron transfer; singlet molecular oxygen
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Two novel monofullerene-bis(pyropheophorbide a) complexes were synthesized and their photophysical properties were studied by using both steady-state and time-resolved techniques. It was revealed that in the pyropheophorbide a (pyroPheo)-C-60 molecular system (FP1) strong quenching of the first excited singlet state of the pyroPheo and, as result, dramatically decreasing of photosensitized singlet oxygen generation occurs by efficient photoinduced electron transfer to the fullerene molecule with a rate constant of 2.5 x 10(9) s(-1). In contrast, the fullerene hexaadduct-bis(pyroPheo) system (FHP1), which possesses five diethyl malonate addends in the remaining octahedral positions, shows a high singlet oxygen quantum yield which is due to the reduced fullerene chromophore which is not a good electron acceptor anymore. (C) 2004 Elsevier B.V. All rights reserved.
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