Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 17, Issue 11, Pages 3147-3156Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201002446
Keywords
antenna; electron transfer; energy transfer; fullerenes; photosynthesis
Categories
Funding
- National Science Foundation [0804015, EPS-0903806]
- State of Kansas through Kansas Technology Enterprise Corporation [20108010, 21750146]
- Osaka University from Ministry of Education, Culture, Sports, Science and Technology, Japan
- KOSEF/MEST from Korea [R31-2008-000-10010-0]
- Grants-in-Aid for Scientific Research [23750014, 20108001, 20108010] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [804015] Funding Source: National Science Foundation
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A series of molecular triads, composed of closely positioned boron dipyrrin-fullerene units, covalently linked to either an electron donor (donor(1)-acceptor(1)-acceptor(2)-type triads) or an energy donor (antennadonor(1)-acceptor(1)- type triads) was synthesized and photoinduced energy/electron transfer leading to stabilization of the charge-separated state was demonstrated by using femtosecond and nanosecond transient spectroscopic techniques. The structures of the newly synthesized triads were visualized by DFT calculations, whereas the energies of the excited states were determined from spectral and electrochemical studies. In the case of the antenna-donor(1)-acceptor(1)-type triads, excitation of the antenna moiety results in efficient energy transfer to the boron dipyrrin entity. The singlet-excited boron dipyrrin thus generated, undergoes subsequent energy and electron transfer to fullerene to produce a boron dipyrrin radical cation and a fullerene radical anion as charge-separated species. Stabilization of the charge-separated state in these molecular triads was observed to some extent.
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