Isolated-alkene-linked porous organic polymers (BIT-POPs): Facile synthesis via ROMP and distinguishing overlapped signals in solid-state 13C NMR

Porous organic polymers (POPs) represented a class of promising materials for delivering environmental and energy issues worldwide. However, the nature of amorphous makes their structure characterization in the solid state very challenging. In addi-tion, the facile syntheses and applications of POPs with novel structures remained as urging issues to improve. In this work, novel porous organic polymers (named BIT-POPs) with the isolated trans-alkene linkage were synthesized by cross-linking the bis-norbornene via ring-opening-metathesis-polymerization (ROMP) in an extremely mild and fast manner. Spectral editings such as 13C-CPMAS, 13C-CPPI and 13C-CPNQS in solid-state NMR were used to distinguish the overlapped NMR signals of insoluble BIT-POPs, as well as two-dimentional 1H-13C HETCOR spectra. And the BIT-POP-5 was added to the polysulfone matrix as a porous filler to form mixed-matrix membrane, which showed 126% increase for the CO2 permeability in the gas separation.