A azine-linked covalent organic framework, COF-JLU2, was designed and synthesized by condensation of hydrazine hydrate and 1,3,5-triformylphloroglucinol under solvothermal conditions for the first time. The new covalent organic framework material combines permanent micropores, high crystallinity, good thermal and chemical stability, and abundant heteroatom activated sites in the skeleton. COF-JLU2 possesses a moderate BET surface area of over 410 m² g⁻¹ with a pore volume of 0.56 cm³ g⁻¹. Specifically, COF-JLU2 displays remarkable carbon dioxide uptake (up to 217 mg g⁻¹) and methane uptake (38 mg g⁻¹) at 273 K and 1 bar, as well as high CO₂/N₂ (77) selectivity. Furthermore, we further highlight that it exhibits a higher hydrogen storage capacity (16 mg g⁻¹) than those of reported COFs at 77 K and 1 bar.

A luminescent conjugated microporous polymer (BCMP-3) has been synthesized in high yield by a carbon–carbon coupling reaction using triarylboron as a building unit. BCMP-3 was fully characterized by using powder X-ray diffraction analysis, Fourier transform infrared spectroscopy, ¹³C solid-state NMR spectroscopy, field emission scanning electron microscopy, thermogravimetric analysis, and nitrogen and carbon dioxide adsorption. The new three-dimensional conjugated framework possess a high Brunauer–Emmett–Teller (BET) specific surface area up to 950 m² g⁻¹ with a pore volume of 0.768 cm³ g⁻¹, good stability, and abundant boron sites in the skeleton. Under excited-light irradiation, BCMP-3 exhibits strong fluorescent emission at 488 nm with a high absolute quantum yield of 18 % in the solid state. Polymer BCMP-3 acts as a colorimetric and fluorescent chemosensor with high sensitivity and selectivity for F⁻ over other common anions. In addition, the polymer also works as an adsorbent for F⁻ removal and shows good adsorption capacities of up to 24 mg g⁻¹ at equilibrium F⁻ concentrations of 16 mg L⁻¹ and a temperature of 298 K. The adsorption kinetics and isotherm were analyzed by fitting experimental data with pseudo-second-order kinetics and Langmuir equations. Furthermore, we highlight that BCMP-3 is an adsorbent for fluoride removal that can be efficiently reused many times without loss of adsorption efficiency.

A new class of multichelating bis(imino)pyridine compounds can promote the direct arylation of unactivated arene CH bonds with aryl iodides and bromides in the presence of potassium tert-butoxide. This transition-metal-free process provides a promising system for cheap and efficient synthesis of biaryl structural units.