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|
Bibliographical noteFunding Information:
The work at Yonsei was financially supported by the National Creative Research Initiatives Program of the Ministry of Science and Technology of Korea to D. Kim. The work at Kyoto was partly supported by Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology, Japan and 21st Century COE on Kyoto University Alliance for Chemistry to A. Osuka. The authors greatly thank Prof. Eric Vauthey (University of Geneva, Genève, Switzerland) for his kind comments.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Physics and Astronomy(all)