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.
|Number of pages||10|
|Journal||Journal of Photochemistry and Photobiology A: Chemistry|
|Issue number||2-3 SPEC. ISS.|
|Publication status||Published - 2006 Mar 20|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Physics and Astronomy(all)