β-to-β 2,5-Pyrrolylene linked cyclic porphyrin oligomers have been synthesized by Suzuki–Miyaura coupling of 2,5-diborylpyrrole and 3,7-dibromoporphyrin. The cyclic porphyrin oligomers exhibit roughly coplanar structures, strong excitonic coupling, small electrochemical HOMO–LUMO gaps, and ultrafast excitation energy transfer between the neighboring porphyrins via the pyrrolylene bridge.
Bibliographical noteFunding Information:
We thank Prof. Xiaoyi Yi (Central South University, China) for 3 Ni crystal measurement. The work at Hunan Normal University was supported by the National Natural Science Foundation of China (Grant No. 21272065), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, and Scientific Research Fund of Hunan Provincial Education Department (Grant No. 13k027). The work at Kyoto was supported by a Grant-in-Aid from MEXT (No. 25220802 (Scientific Research (S)). The research at Yonsei University was supported by the Global Research Laboratory (GRL) Program (2013K1A1A2A02050183) of the Ministry of Education, Science and Technology (MEST) of Korea. The quantum calculations were performed using the supercomputing resource of the Korea Institute of Science and Technology Information (KISTI).
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All Science Journal Classification (ASJC) codes
- Organic Chemistry