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Excitation energy migration in a dodecameric porphyrin box

Paper ID Volume ID Publish Year Pages File Format Full-Text
29342 44158 2006 10 PDF Available
Title
Excitation energy migration in a dodecameric porphyrin box
Abstract

The excitation energy hopping (EEH) in a dodecameric porphyrin box (TB2) prepared by self-assembly of four meso–meso linked zinc(II) 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 Förster 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.

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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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 178, Issues 2–3, 20 March 2006, Pages 130–139
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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