Configurational Selectivity Study of Two-dimensional Covalent Organic Frameworks Isomers Containing D2h and C2 Building Blocks

Zheng, Xuhan; Zhang, Lin; Xie, Chenxiao; Wang, Hui; Liu, Hui; Pan, Qingyan; Zhao, Yingjie

doi:10.1007/s40242-022-2001-5

Cited by 3 publications

(4 citation statements)

References 54 publications

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“…56 This unusual high mobility in metallic Ge 0.33 NbS 2 finally results in ultrahigh conductivity as we observed in transport measurements. Considering the extended application of two-dimensional materials, [57][58][59] mechanical exfoliation was also carried out on these two van der Waals Nb dichalcogenides. Based on the bulk crystals, two-dimensional nanoflakes of Ge 0.33 NbS 2 and Ge 0.26 NbSe 2 could be easily obtained by using the scotch tape method.…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh conductivity and non-trivial band structure in van der Waals Nb dichalcogenides with Ge intercalation

Han

Liu

Guo

et al. 2023

Mater. Chem. Front.

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Section: Resultsmentioning

confidence: 99%

Ultrahigh conductivity and non-trivial band structure in van der Waals Nb dichalcogenides with Ge intercalation

Han

Liu

Guo

et al. 2023

Mater. Chem. Front.

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“…However, when the substituent length is increased, only rhombic products are generated regardless of the reaction conditions such as solvent, temperature, and reaction time. [36] Recently, the twisted tetragonal N,N,N',N'-tetraphenyl-1,4phenylenediamine (TAPD, Figure 3b) node, which adopts a chair-like configuration formed by the counter-clockwise rotation of the triphenylamine moieties, has been identified as a suitable building block for dual-pore Kagome type COFs. [37][38][39] By combining TAPD with terephthalaldehyde, benzodithiophene dialdehyde, 2,5-dimethylbenzene-1,4-dicarboxaldehyde, and 2,5-dimethoxybenzene-1,4-dicarboxaldehyde, various 2D kgm COFs including WTA, WBD, TAPD-(Me) 2 , and TAPD-(OMe) 2 have been synthesized, respectively.…”

Section: Typical [4 + 2] Co-polymerization Synthetic Strategymentioning

confidence: 99%

“…Similar to the ETTA COF, the afforded kgm BTA COFs with AA stacking modes exhibit the lowest total energy among other possible structures, as confirmed by molecular mechanics calculations. However, when the substituent length is increased, only rhombic products are generated regardless of the reaction conditions such as solvent, temperature, and reaction time [36] …”

Section: Synthetic Strategies Toward 2d Kgm Cofsmentioning

confidence: 99%

2D Covalent Organic Frameworks with Kagome Lattice: Synthesis and Applications

Tu,

Song,

Chen

et al. 2023

Chemistry A European J

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2D covalent organic frameworks with kagome (kgm) topology are a promising class of crystalline frameworks that possess both triangular micropores and hexagonal mesopores. These dual‐pore structures enable kgm COFs to exhibit unique advantages in selective separation, mass transfer, and targeted drug release. However, the synthesis of 2D kgm COFs has been hindered by the reliance on empirical methods. In this review, we systematically summarize the conventional macrocycle‐to‐framework strategy, typical [4+2] co‐polymerization synthetic strategy, and bifunctional molecules self‐condensation approach for constructing 2D kgm COFs. We also survey the factors influencing formation of kgm lattice such as monomer type, solvent polarity, substrate concentration, etc., and highlight the representative examples on targeted synthesis. Additionally, we summarize the applications of 2D kgm COFs and the relationships between structure and performances. Finally, we propose key fundamental perspectives to accelerate the further development of this intriguing material.

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“…This “clean and perfectly straight” pore structure of COFs normally leads to a possible desorption process, i.e., the desorption and adsorption processes occur simultaneously, which limits the further improvement of the maximum iodine adsorption capacity. To address this challenging issue, it is, therefore, necessary to adjust the pore structure and morphology of COFs by controlling the stacking form [ 36 , 37 , 38 , 39 , 40 ] or introducing flexible building blocks [ 41 , 42 , 43 , 44 ]. In this case, the twisted pore structure, rather than the perfectly straight structure, can efficiently expose the adsorption site while hindering the desorption process of iodine molecules, thus leading to the maximum adsorption capacity [ 42 , 43 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Polymorphic Covalent Organic Frameworks: Molecularly Defined Pore Structures and Iodine Adsorption Property

Wang

Jiang

et al. 2023

Molecules

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Radioactive iodine-capturing materials are urgently needed for the emerging challenges in nuclear waste disposal. The various pore structures of covalent organic frameworks (COFs) render them promising candidates for efficient iodine adsorption. However, the detailed structure–property relationship of COFs in iodine adsorption remains elusive. Herein, two polymorphic COFs with significantly different crystalline structures are obtained based on the same building blocks with varied molecular ratios. The two COFs both have high crystallinity, high specific surface area, and excellent chemical and thermal stability. Compared with the [C4+C4] topology (PyT-2) with an AA stacking form, the [C4+C2] topology (PyT-1) with an AB stacking form has more twisted pore channels and complex ink-bottle pores. At ambient conditions, PyT-1 and PyT-2 both exhibit good adsorption properties for iodine capture either in a gaseous or liquid medium. Remarkably, PyT-1 presents an excellent maximum adsorption capacity (0.635 g g−1), and the adsorption limit of PyT-2 is 0.445 g g−1 in an n-hexane solution with an iodine concentration of 400 mg L−1, which is highly comparable to the state-of-the-art iodine absorption performance. This study provides a guide for the future molecular design strategy toward novel iodine adsorbents.

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Configurational Selectivity Study of Two-dimensional Covalent Organic Frameworks Isomers Containing D2h and C2 Building Blocks

Cited by 3 publications

References 54 publications

Ultrahigh conductivity and non-trivial band structure in van der Waals Nb dichalcogenides with Ge intercalation

Ultrahigh conductivity and non-trivial band structure in van der Waals Nb dichalcogenides with Ge intercalation

2D Covalent Organic Frameworks with Kagome Lattice: Synthesis and Applications

Polymorphic Covalent Organic Frameworks: Molecularly Defined Pore Structures and Iodine Adsorption Property

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