Axially B-arylene-bridged "dumbbell" BIII -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.
Keywords: axial-aryl; nanorings; reductive coupling; subporphyrin; “dumbbell”.
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