Dodecanuclear Hexagonal-Prismatic M₁₂L₁₈ Coordination Cages by Subcomponent Self-assembly

Dodecanuclear hexagonal-prismatic M12L18 cages were prepared by a subcomponent self-assembly process with commercially available pyridinecarboxaldehyde, m-xylenediamine, and cadmium­(II) perchlorate or manganese­(II) perchlorate. The NMR spectrum of the Cd cage shows that there are three independent ligand sets, and the X-ray crystal structure of the Mn cage reveals that the structure has both fac-Δ- and mer-Λ-configured metal centers in a 1:1 ratio. The cage structure also has a large cavity that contains five perchlorate anions.十二核六方棱柱形M12L18笼状结构通过亚组分自组装工艺制备，所用原料为市售吡啶甲醛、间苯二甲胺以及高氯酸镉(II)或高氯酸锰(II)。该镉基笼状物的核磁共振波谱显示存在三种独立的配体环境；而锰基笼状物的X射线晶体结构表明，其结构中以1:1的比例同时存在面式Δ构型与经式Λ构型的金属中心。该笼状结构还带有一个大尺寸空腔，内部包埋有五个高氯酸根阴离子。