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Capture and Reversible Storage of Volatile Iodine by Novel Conjugated Microporous Polymers Containing Thiophene Units

Qian, Xin, Zhu, Zhao-Qi, Sun, Han-Xue, Ren, Feng, Mu, Peng, Liang, Weidong, Chen, Lihua, Li, An
ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 21063-21069
Fourier transform infrared spectroscopy, adsorption, coordination polymers, iodine, nanopores, nitrogen, nuclear magnetic resonance spectroscopy, physicochemical properties, polymerization, porosity, porous media, scanning electron microscopes, scanning electron microscopy, stable isotopes, surface area, thiophene, zeolites
Conjugated microporous polymers having thiophene building blocks (SCMPs), which originated from ethynylbenzene monomers with 2,3,5-tribromothiophene, were designedly synthesized through Pd(0)/CuI catalyzed Sonogashira–Hagihara cross-coupling polymerization. The morphologies, structure and physicochemical properties of the as-synthesized products were characterized through scanning electron microscope (SEM), thermogravimeter analysis (TGA), ¹³C CP/MAS solid state NMR and Fourier transform infrared spectroscope (FTIR) spectra. Nitrogen sorption–desorption analysis shows that the as-synthesized SCMPs possesses a high specific surface area of 855 m² g–¹. Because of their abundant porosity, π-conjugated network structure, as well as electron-rich thiophene building units, the SCMPs show better adsorption ability for iodine and a high uptake value of 222 wt % was obtained, which can compete with those nanoporous materials such as silver-containing zeolite, metal–organic frameworks (MOFs) and conjugated microporous polymers (CMPs), etc. Our study might provide a new possibility for the design and synthesis of functional CMPs containing electron-rich building units for effective capture and reversible storage of volatile iodine to address environmental issues.