科研之友
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摘要
An ethyne-bridged Ni2+ porphyrin-[26]hexaphyrin-Ni2+ porphyrin triad (4) has been prepared and shown to adopt a dumbbell-like conformation despite the two bulky porphyrinylethynyl groups at the hinge positions of the hexaphyrin. The (HNMR)-H-1 and UV/vis/NIR spectra of 4 revealed that the aromatic nature of the [26]hexaphyrin unit was significantly mitigated via conjugative interaction with the porphyrinylethynyl substituents. Thermal transannular cyclization of 4 proceeded smoothly to give vinylene-bridged triad 12, in which the -systems of the Ni2+ porphyrins and [26]hexaphyrin are not conjugated and the aromatic character of the latter is enhanced.
- 出版日期2016-2
