Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 178, Issue 2-3, Pages 130-139Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2005.10.029
Keywords
self-assembled porphyrin array; exciton coupling; excitation energy hopping (EEH); transient absorption anisotropy (TAA); exciton-exciton annihilation; coupling energy matrix
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The excitation energy hopping (EEH) in a dodecameric porphyrin box (TB2) prepared by self-assembly of four meso-meso linked zinc(ll) triporphyrin (T2)s is explored by picosecond fluorescence and femtosecond transient absorption (TA) spectroscopy. The exciton-exciton annihilation and anisotropy depolarization observed in both fluorescence and TA provide a consistent EEH rate, i.e. 300 20 ps(-1), assuming Forster energy hopping among four T2 units in TB2. The observed energy hopping time 300 20 ps(-1) is slower than the previous 98 3 ps(-1) of B2 (an octameric porphyrin box), even though the size of hopping unit is larger in TB2. (c) 2005 Elsevier B.V. All rights reserved.
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