Synthesis of Microporous Nitrogen‐Rich Covalent‐Organic Framework and Its Application in CO₂ Capture

Abstract

An imine‐based nitrogen‐rich covalent‐organic framework (COF) was successfully synthesized using two triangular building units under solvothermal reaction condition. The gas adsorption properties of the obtained microporous nitrogen‐rich COF were investigated. The results indicated that the activated COF material presented good up take capabilities of CO2 and CH4 at 61.2 and 43.4 cm3·g−1 at 1 atm and 273 K, respectively, showing its application potential in selective gas capture and separation.

A Carbocationic Triarylmethane‐Based Porous Covalent Organic Network

“…[30] At pressures highert han 0.5 bar,achange in the isotherm inclinationi so bserved, indicating the formation of multilayers. At 5bar, RIO-70 has an uptake of 4.6 mmol g À1 ,a nd 6.8 mmol g À1 at 20 bar,h owever,t he isotherm did not show a saturation point.T he CO 2 uptake at 1bar presented ah igher value than other 2D COFs, for example, 1.44 mmol g À1 for N-COF, [31] 2.1 mmolg À1 for TDCOF-5, [32] 1.5 mmolg À1 for Cz-COF, [33] and 2.3 mmolg À1 for Tz-COF, [33] at 298 K; other materials, such as SIFSIX-2-Cu [34] (1.84 mmol g À1 ), can be compared at 298 K. At higher pressures, the same trend is observed. CO 2 uptake at 5bar for RIO-70 is 4.6 mmol g À1 and for TRITER1 is 3.11mmol g À1 .…”

Improved Synthesis of β-Ketoenamine-Linked Covalent Organic Frameworks via Monomer Exchange Reactions

“…The collected material was washed with hot DMF, acetone, and ethanol before activation under dynamic vacuum at 120 °C overnight. Characterization of the activated materials by Fourier transform infrared spectroscopy (FT-IR), 13 C cross-polarization magic angle spinning (CP-MAS) NMR spectroscopy, and elemental analysis (see Supplementary Information -sections IX -XI) is consistent with full conversion to the β-ketoenamine linkage. Additionally, following the completion of each reaction, soluble organics were extracted, isolated, and characterized by 1 H NMR spectroscopy ( Figure S80).…”

“…Five previously reported imine-linked COFs with TFB as the node were synthesized using conditions that provide the greatest crystallinity and porosity. [11][12][13][14] Monomer exchange was conducted by exposing these imine-linked COFs to one equivalent of TFP (with respect to TFB) in a deoxygenated mixture of 1,4-dioxane, mesitylene, and 6 M CH3CO2H (3:3:1 volume ratio) at 120 °C for 3 days. The collected material was washed with hot DMF, acetone, and ethanol before activation under dynamic vacuum at 120 °C overnight.…”

Two-dimensional porphyrin- and phthalocyanine-based covalent organic frameworks

“…Due to 12 their permanent porosity, structural periodicity and high thermal 13 stability, COFs have triggered substantial research interest over the 14 past decade for potential applications in gas storage and separation 15 [4][5][6][7][8][9], catalysis [10,11], sensing [12,13], optoelectronic devices 16 [14,15] and energy storage [16][17][18]. Two-dimensional (2D) COFs, 17 in which the 2D polymer sheets stack in a columnar manner to 18 form a layered eclipsed structure [19], provide a unique means to 19 construct ordered p systems for efficient charge carrier transport 20 through the framework and have potential for developing new p- 21 electronic and photofunctional materials [20].…”