β-to-β 2,5-Pyrrolylene-Linked Cyclic Porphyrin Oligomers.
Yutao RaoJun Oh KimWoojae KimGuangming ZhongBangshao YinMingbo ZhouHiroshi ShinokuboNaoki ArataniTakayuki TanakaShubin LiuAtsuhiro OsukaDongho KimJianxin SongPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2016)
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.