In the first part, we employ a two-step strategy for accessing crystalline porous covalent networks of highly conjugated π-electron systems. For this, we first assembled a crystalline metal-organic framework (MOF) precursor based on Zr(IV) ions and a linear dicarboxyl linker molecule featuring backfolded, highly unsaturated alkyne backbones; massive thermocyclization of the organic linkers was then triggered to install highly conjugated, fused-aromatic bridges throughout the MOF scaffold while preserving the crystalline order, see Figure 1. The resultant polycyclic aromatic network exhibits greatly enhanced stability, electroactivity and charge transport. We will share our visions on leveraging this two-step synthetic strategy for accessing the iconic carbon Schwarzites as 3D analogues of graphene. In the second part, we will describe progresses in accessing porous molecular solids from a novel class of self-similar molecules (Sierpinski molecules, also illustrated in the linker molecule in Figure 1) featuring symmetrically backfolded geometries that sharply contrast the traditional starburst, outgoing shapes of dendrimers. These molecular materials features promising properties of solution processability, water and air stability, and distinct photoelectric activity.

Sierpinski molecules, carbon schwarzites and porous materials for catalytic and electronic applications

2019 Fall National Meeting

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