High CO₂uptake and selectivity by triptycene-derived benzimidazole-linked polymers

Abstract

Successful incorporation of triptycene into benzimidazole-linked polymers leads to the highest CO(2) uptake (5.12 mmol g(-1), 273 K and 1 bar) by porous organic polymers and results in high CO(2)/N(2) (63) and CO(2)/CH(4) (8.4) selectivities.

Triazine containing N-rich microporous organic polymers for CO 2 capture and unprecedented CO 2 /N 2 selectivity

“…The CO2 philicity of the polymeric network has tremendously increased from previously reported modified polycarbazole and polytriphenylamine. CO2 uptakes of these two materials are also very comparable with previously best reported COFs [38,39], MOFs [40,41], N-doped microporous carbons [42,43], hypercrosslinked porous polymers [44][45][46] , etc. The high density of basic nitrogen sites of triazine present in the polymer network which interact with ewis acidic CO2 molecules via dipole quadrapole interaction, are responsible for huge CO2 uptake [47].…”

Trends and challenges for microporous polymers

“…Catalysts-free polycondensations or Friedel-Crafts synthesis routes are therefore valuable alternative synthetic routes. Microporous polymers containing benzimidazole 16,17 or triazine linkages 43 are an example with high CO 2 uptakes which can be synthesized without the need for a catalyst. Networks synthesized from both dichloromethyl monomers 44 and those using an external crosslinker 45 by Friedel-Crafts reactions were shown to have high uptakes particularly at higher pressures used for pre-combustion capture.…”

“…Synthetic protocols which can be used for the generation of microporous polymers are highly diverse and range from metalcatalyzed or -mediated (Sonogashira, 4,5 Suzuki, 6 Yamamoto, 7 Buchwald-Hartwig, 8 Eglinton, 9 Heck 10 ) to click-type reactions, 11 acid or base-catalyzed polycondensation reactions (formation of polyamides, 12 -imides, [13][14][15] -benzimidazoles, 16,17 -dioxanes, 18 -boroxines and boronate esters, 19 -imines 20 -aminals, 22 azo-bridged compounds [23][24][25] and many others [26][27][28][29] The great variety of synthesis conditions not only allows the usage of differentially functionalized monomers, but much more importantly to find appropriate reaction conditions tolerating any given functional group which is planned to be introduced into the network, i.e. synthesis can be carried out with high chemical orthogonality.…”

Unprecedented high-temperature CO2 selectivity in N2-phobic nanoporous covalent organic polymers

“…These mostly organic polymers can easily be designed and constructed via facile synthetic protocols. To date, several crystalline and amorphous nanoporous organic materials with tunable functionality have been developed-namely, COF 14 , PIM 15 , HCP and CMP 16,17 , CTF 18 , PAF 19 , PPN 20 , POF 21 , BILP 22 , EOF 23 , PECONF 24 and COP 25 .…”