2021
DOI: 10.1002/ange.202015130
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Polymorphism of 2D Imine Covalent Organic Frameworks

Abstract: We designed and synthesized A 2 B 2 type tetraphenyl benzenemonomers (p-, m-, and o-TetPB) whichhave the para-,meta, and ortho-substituted isomeric structures,for the direct construction of isomeric frameworks.I nterestingly,b oth kagome (kgm)a nd monoclinic square (sql)f ramework isomers are produced from either p-TetPB (C 2h symmetry) or m-TetPB (C 2v symmetry) by changing reaction solvents,w hile their isomeric structures are characterized by X-rayd iffraction, computational simulation, microscopy, and sorp… Show more

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Cited by 22 publications
(3 citation statements)
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“…Compared with the two starting monomers, both the CQO stretching vibration (1697 cm À1 ) and the N-H stretching vibration (3300-3500 cm À1 ) disappear in the Fourier-transform infrared (FT-IR) spectrum of NiPr-TPA-COF. A new peak at 1617 cm À1 is instead observed in line with previous results, 30,31 attesting to the complete condensation and the formation of the imine linkage (Fig. 1c).…”
Section: Resultsmentioning
confidence: 99%
“…Compared with the two starting monomers, both the CQO stretching vibration (1697 cm À1 ) and the N-H stretching vibration (3300-3500 cm À1 ) disappear in the Fourier-transform infrared (FT-IR) spectrum of NiPr-TPA-COF. A new peak at 1617 cm À1 is instead observed in line with previous results, 30,31 attesting to the complete condensation and the formation of the imine linkage (Fig. 1c).…”
Section: Resultsmentioning
confidence: 99%
“…Covalent organic frameworks (COFs) are characteristics of their ordered polygonal backbones and aligned onedimensional (1D) channels. [4][5][6][7][8][9][10] Especially, the high capability of predesigning pores, namely pore shape, size, and environment, renders COFs able to create desired nanochannels with discrete pore parameters. This distinct feature empowers a continuously increasing broad interest in exploring COFs as a porous platform for mass transport.…”
Section: Introductionmentioning
confidence: 99%
“…These different behaviours resulted from differences in pore geometry and the H-bonding manner of the isostructural HOFs. Their physical properties are affected significantly by the isomeric effect 52,53 of the peripheral groups, while DBC cores are useful for isostructural construction by shape-fitted docking. These results suggest the importance of peripheral groups and provide molecular design insights for the systematic construction of porous molecular crystalline materials.…”
Section: Introductionmentioning
confidence: 99%