Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 27, Pages 6925-6928Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201400835
Keywords
dendrimers; electron transfer; energy transfer; host-guest systems; porphyrin
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Funding
- Mid-Career Researcher Program - National Research Foundation (NRF) under the Ministry of Science, ICT Future, Korea [2012005565]
- Global Frontier R&D Program of the Center for Multiscale Energy System [2012-8-2081]
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An artificial light-harvesting multiporphyrin dendrimer (8P(Zn)P(FB)) composed of a focal freebase porphyrin (P-FB) with eight zinc(II) porphyrin (P-Zn) wings exhibited unique photophysical property switching in response to specific guest molecule binding. UV/Vis titration studies indicated stable 1: 2 host-guest complex formation between 8P(Zn)P(FB) and meso-tetrakis(4-pyridyl)-porphyrin (TPyP) for which the first and second association constants were estimated to be > 10(8) m(-1) and 3.0 x 10(7) m(-1), respectively. 8P(Zn)P(FB) originally shows 94% energy transfer efficiency from P-Zn to the focal P-FB. By the formation of the host-guest complex (8P(Zn)P(FB) 2TPyP) the emission intensity of 8P(Zn)P(FB) is significantly decreased, and an ultrafast charge separation state is generated. The energy transfer process from P-Zn wings to the P-FB core in 8P(Zn)P(FB) is almost entirely switched to an electron transfer process by the formation of 8P(Zn)P(FB)center dot 2TPyP.
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