β,β-tripyrrin-bridged earring porphyrins were synthesized through Suzuki-Miyaura cross coupling reactions. These porphyrinoids have multiple cavities and can accommodate two or three metal ions per molecule. The structures of the porphyrins have been elucidated by x-ray diffraction analysis, and feature curved π planes. The electronic spectra of the porphyrins exhibit near-infrared (NIR) absorptions and metal insertion leads to red-shifted and intensified absorption features. Electrochemical analysis and transient absorption measurements indicated that the porphyrins exhibit effective electronic communication between their central and peripheral moieties. Porphyrins with ears: β,β-Tripyrrin-bridged "earring" porphyrins were synthesized by Suzuki-Miyaura cross coupling reactions. These compounds have multiple cavities that can complex up to three metal ions. The porphyrin structures feature curved π planes, and their electronic spectra show near-infrared (NIR) absorptions. Metal insertion leads to red-shifted and intensified near-infrared absorption features.
Bibliographical noteFunding Information:
We thank Dr. Zier Yan (Rigaku Beijing Corporation, China) for help in crystallographic analysis. 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 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.
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