Synthesis of Direct β-to-β Linked Porphyrin Arrays with Large Electronic Interactions: Branched and Cyclic Oligomers
Hao Cai, Keisuke Fujimoto, Dr. Jong Min Lim, Chaojie Wang, Weiming Huang, Yutao Rao, Senmiao Zhang, Hui Shi, Dr. Bangshao Yin, Prof. Dr. Bo Chen, Prof. Dr. Ming Ma, Prof. Dr. Jianxin Song, Prof. Dr. Dongho Kim and Prof. Dr. Atsuhiro Osuka
Article first published online: 25 AUG 2014 | DOI: 10.1002/anie.201407032
Molecular twine: The title porphyrin trimers and pentamers have been synthesized by Suzuki–Miyaura coupling of β-boryl-porphyrins and β-bromoporphyrins. The cyclic porphyrin trimer, the smallest directly linked cyclic porphyrin, and its twined pentamer exhibit small HOMO–LUMO gaps, broad nonsplit Soret bands, red-shifted Q-bands, and efficient excitation-energy hopping.