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A novel helicate complex [Fe II 2 L 3 ] 4+ resulted from subcomponent self-assembly of a C 3-symmetric triamine, 2-formylpyridine and octahedral iron(II) in CH 3 CN, which was confirmed by ESI-MS measurement. After the addition of selected planar aromatic molecules in CD 3 CN solution, shifts of 1 H NMR signals of the helicate were investigated. The results revealed that the size, functional group and symmetry of guest molecules remarkably influence the interaction patterns.

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