Unexpected Isolation of a Pentameric Metallomacrocycle from the Fe-II-Mediated Complexation of 120 degrees Juxtaposed 2,2 ':6 ',2 ''-Terpyridine Ligands

摘要

Self-assembly of specially designed building blocks has been widely employed in the construction of rigid supramolecular structures.[1] Towards this goal, many successful strategies have been developed for the synthesis of metallomacrocycles, such as for trigonal,[2] rectangular,[3] hexagonal,[4] heptagonal,[5] and octagonal[6] structures. In contrast, only a limited number of pentagonal[7] shapes have been reported in the literature. Accordingly, building blocks require a suitable angle to generate five-sided motifs. For example, a carbazole unit that introduced a 1058 angle between two terpyridine ligands was readily self-assembled to give metallopentacycles.