A series of novel porous polymer frameworks (PPFs) with [3 + 4] structure motif have been synthesized from readily accessible building blocks via imine condensation, and the dependence of gas adsorption properties on the building block dimensions and functionalities was studied. The resulting imine-linked frameworks exhibit high surface area: the Brunauer–Emmett–Teller (BET) specific surface area up to 1740 m2 g–1, and a Langmuir surface area up to 2157 m2 g–1. More importantly, the porous frameworks exhibit outstanding H2 (up to 2.75 wt %, 77 K, 1 bar), CO2 (up to 26.7 wt %, 273 K, 1 bar), CH4 (up to 2.43 wt %, 273 K, 1 bar), and C2H2 (up to 17.9 wt %, 273 K, 1 bar) uptake, which are among the highest reported for organic porous materials. PPFs exhibit good ideal selectivities for CO2/N2 (14.5/1–20.4/1), and CO2/CH4 adsorption (8.6/1–11.0/1), and high thermal stabilities (up to 500 °C), thus showing a great potential in gas storage and separation applications.

Two novel porous 2D covalent organic frameworks (COFs) with periodically heterogeneous pore structures were successfully synthesized through desymmetrized vertex design strategy. Condensation of C(2v) symmetric 5-(4-formylphenyl)isophthalaldehyde or 5-((4-formylphenyl)ethylene)isophthalaldehyde with linear hydrazine linker under the solvothermal or microwave heating conditions yields crystalline 2D COFs, HP-COF-1 and HP-COF-2, with high specific surface areas and dual pore structures. PXRD patterns and computer modeling study, together with pore size distribution analysis confirm that each of the resulting COFs exhibits two distinctively different hexagonal pores. The structures were characterized by FT-IR, solid state (13)C NMR, gas adsorption, SEM, TEM, and theoretical simulations. Such rational design and synthetic strategy provide new possibilities for preparing highly ordered porous polymers with heterogeneous pore structures.

No abstract

No abstract

This review summarizes and discusses the recent progress in porous organic polymers for diverse biomedical applications such as drug delivery, biomacromolecule immobilization, phototherapy, biosensing, bioimaging, and antibacterial applications.