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Guest‐Induced Photophysical Property Switching of Artificial Light‐Harvesting Dendrimers
Author(s) -
Jeong YoungHwan,
Son Minjung,
Yoon Hongsik,
Kim Pyosang,
Lee DoHyung,
Kim Dongho,
Jang WooDong
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201400835
Subject(s) - dendrimer , porphyrin , zinc , titration , chemistry , energy transfer , electron transfer , molecule , fluorescence , photochemistry , inorganic chemistry , polymer chemistry , organic chemistry , optics , chemical physics , physics
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 3.0×10 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 ⋅ 2 TPyP ) 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 ⋅ 2 TPyP .
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