期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 4, 页码 1672-1679出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja4124048
关键词
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资金
- Midcareer Researcher programs [2012005565, 2010-0029668]
- Global Frontier R&D Program on Center for Multiscale Energy System [2012-8-2081]
- National Research Foundation under the Ministry of Science, ICT Future, Korea
A bisindole-bridged-porphyrin tweezer (1), a pair of zinc porphyrins (P-Zn'S) connected to bisindole bridge (BB) via the Cu-I-mediated alkyne-azide click chemistry, exhibited unique switching in forward and backward photoinduced energy transfer by specific guest bindings. The addition of Cu2+ caused a change in electronic absorption and fluorescence quenching of 1. MALDI-TOF-MS and FT-IR analyses indicated the formation of stable coordination complex between 1 and Cu2+ (1-Cu(II)). Without Cu2+ coordination, the excitation energy flows from BB to P-Zn's with significantly high energy transfer efficiency. In contrast, the direction of energy flow in 1 was completely reversed by the coordination of Cu2+. The difference in fluorescence quantum yield between 1 and 1-Cu(II) indicates that more than 95% of excitation energy of P-Zn flows into Cu(II)-coordinated BB. The energy transfer efficiency was further controlled by bidentate ligand coordination onto 1-Cu(II). When pyrophosphate ion was added to 1-Cu(II), the recovery of fluorescence emission from P-Zn was observed. The quantum mechanical calculations indicated that the Cu(II)-coordinated BB has square planar geometry, which can be distorted to form octahedral geometry due to the coordination of bidentate ligands.
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