Inspired by nature, hierarchical self-assembly has attracted wide attention in biomimetics, materials science, and nanotechnology. Controlling the self-assembly of giant molecular building blocks into complex architectures with similar hierarchy to biological species remains a major challenge in supramolecular chemistry. Akin to protein structure, here we present the self-assembly of giant molecular nanocapsules into supramolecular coordination polymers with controlled hierarchy from primary to secondary and tertiary structures. First, we successfully prepared discrete nanocapsules (secondary structures) consisting of multicomponents (primary structures) such as organic macrocycles (i.e. <i>C</i>-propan-3-ol-pyrogallol[4]arene) and metal-based secondary building units. Second, these nanocapsules can self-organize into various 2-D and 3-D supramolecular coordination polymers (tertiary structures) via coordination-driven assembly. The periphery twenty-four flexible alkyl chains and twenty-four metal ions available for potential coordination make these nanocapsules comparable to functionalized solid nanoparticles with non-specific binding sites at the surface and allow the nanocapsules to self-adjust their orientations and coordination modes to facilitate the self-assembly process. Furthermore, we demonstrated that external base/acid modulators can be utilized to control the hierarchical assembly. This study sheds light on the self-assembly of giant building units with complex molecular structures and opens up possibilities for the design of new hierarchical architectures with innovative properties and functions in many applications such as biomimetics, biomedicine, and molecular devices.<br/>

Hierarchical self-assembly of supramolecular coordination polymers using giant metal-organic nanocapsules as building blocks

2019 Fall National Meeting

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