Axially Arylene‐bridged “Dumbbell” BIII‐Subporphyrin Dimers and A Tetrameric Subporphyrin Nanocage

Axially B-arylene-bridged “dumbbell” B III -subporphyrin (abbreviated as subporphyrin in this paper) dimers 3 , 4 , and 5 were prepared by reactions of B-methoxy subporphyrins with bromoaryl Grignard reagents and subsequent reductive coupling of the resulting B-bromoaryl subporphyrins with Ni(cod) 2 . This reductive coupling method was also used for synthesis of tetrameric subporphyrin nanocage 8 from meso-meso linked subporphyrin dimer 7 . Nanocage 8 displayed a red-shifted Q-like band and reduced fluorescence quantum yield as compared with 6 and 7 .