Naslov
Synthesis and Characterization of Benzene- and Triazine-Based Azo-Bridged Porous Organic Polymers

Autori
Panić, Barbara ; Frey, Tea ; Borovina, Mladen ; Konopka, Kristijan ; Sambolec, Miro ; Kodrin, Ivan ; Biljan, Ivana

Izvornik
Polymers (2073-4360) 15 (2023), 1; 229, 15

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
azo linkages ; CO2 adsorption ; DFT calculations ; nitrogen-rich ; porous organic polymers ; triazine

Sažetak
Porous organic polymers incorporating nitrogen- rich functionalities have recently emerged as promising materials for efficient and highly selective CO2 capture and separation. Herein, we report synthesis and characterization of new two- dimensional (2D) benzene- and triazine-based azo- bridged porous organic polymers. Different synthetic approaches towards the porous azo- bridged polymers were tested, including reductive homocoupling of aromatic nitro monomers, oxidative homocoupling of aromatic amino monomers and heterocoupling of aromatic nitro monomers and a series of aromatic diamines of different lengths and rigidity. IR spectroscopy, 13C CP/MAS NMR spectroscopy, powder X-ray diffraction, elemental analysis, thermogravimetric analysis, nitrogen adsorption–desorption experiments and computational study were used to characterize structures and properties of the resulting polymers. The synthesized azo-bridged polymers are all amorphous solids of good thermal stability, exhibiting various surface areas (up to 351 m2 g􀀀1). The obtained results indicated that the synthetic methods and building units have a pronounced effect on the porosity of the final materials. Reductive and oxidative homocoupling of aromatic nitro and amino building units, respectively, lead to 2D azo-bridged polymers of substantially higher porosity when compared to those produced by heterocoupling reactions. Periodic DFT calculations and Grand-canonical Monte Carlo (GCMC) simulations suggested that, within the used approximations, linear linkers of different lengths do not significantly affect CO2 adsorption properties of model azo-bridged polymers.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA