Simultaneous construction of two linkages for the on-surface synthesis of imine–boroxine hybrid covalent organic frameworks

Yue, Jie-Yu; Mo, Yiping; Li, Shuying; Dong, Weilong; Chen, Ting; Wang, Dong

doi:10.1039/c6sc03590f

Cited by 59 publications

(39 citation statements)

References 43 publications

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“…With CuSO 4 ·5H 2 O regulating the water content, atomic thick sheet would be obtained on the solid surface. Beside imine-linked COFs, this approach was suitable for boroxine-linked and imine-boroxine hybrid linked COFs, too [ 187 , 188 ].…”

Section: Developments Of Cofsmentioning

confidence: 99%

Covalent Organic Frameworks: From Materials Design to Biomedical Application

et al. 2017

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Covalent organic frameworks (COFs) are newly emerged crystalline porous polymers with well-defined skeletons and nanopores mainly consisted of light-weight elements (H, B, C, N and O) linked by dynamic covalent bonds. Compared with conventional materials, COFs possess some unique and attractive features, such as large surface area, pre-designable pore geometry, excellent crystallinity, inherent adaptability and high flexibility in structural and functional design, thus exhibiting great potential for various applications. Especially, their large surface area and tunable porosity and π conjugation with unique photoelectric properties will enable COFs to serve as a promising platform for drug delivery, bioimaging, biosensing and theranostic applications. In this review, we trace the evolution of COFs in terms of linkages and highlight the important issues on synthetic method, structural design, morphological control and functionalization. And then we summarize the recent advances of COFs in the biomedical and pharmaceutical sectors and conclude with a discussion of the challenges and opportunities of COFs for biomedical purposes. Although currently still at its infancy stage, COFs as an innovative source have paved a new way to meet future challenges in human healthcare and disease theranostic.

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Section: Developments Of Cofsmentioning

confidence: 99%

Covalent Organic Frameworks: From Materials Design to Biomedical Application

et al. 2017

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“…This COF, even during synthesis, grows into self‐exfoliated CON. The short triazole linkers (a 120° linker) generate uniform micropores with walls lined by optimally spaced OH and N‐atoms, giving rise to favorable lithium interacting pockets. These groups, phenols and triazoles, being weak acids (p K a , phenol = 10.3; 1,2,4‐triazole = 9.3) are expected to interact mildly with lithium.…”

Section: Introductionmentioning

confidence: 99%

High and Reversible Lithium Ion Storage in Self‐Exfoliated Triazole‐Triformyl Phloroglucinol‐Based Covalent Organic Nanosheets

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Nandi

et al. 2017

Advanced Energy Materials

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aromatic groups, which via columnar π-π stacking order into a periodic 3D structure (Scheme S1, Supporting Information). Their modular construct and ordered porosity makes them find use in diverse applications Here we are seeking application of 2D COFs in metal-ion batteries, which are typically made of electrodes with layered structures, for example, graphite as anode and LiCoO 2 as cathode. Owing to their graphite resembling structure, COF can serve as anode. Since their initial discovery, many 2D materials with comparable layered structures have been explored as lithium insertion-deinsertion materials. [28][29][30][31][32][33][34][35][36][37][38][39] Some of the highly desirable characteristics of a superior anode material include moderate to high surface accessibility to ensure maximum charge storage per unit area, and the other is the hierarchical porosity for favorable kinetics. Exfoliation enhances surface accessibility and active site creation in such 2D materials. [40][41][42][43][44][45][46][47][48] In this regard, COFs could have much more to offer. [49][50][51] Exfoliation in any 2D material is largely dependent on the interlayer forces holding them. Typically, the COF layers are held together by interlayer π-π interactions or in some cases via additional hydrogen bonding. [52,53] However, unlike graphite, the layers of COF are not built from fused aromatic rings. In their optimized Covalent organic framework (COF) can grow into self-exfoliated nanosheets. Their graphene/graphite resembling microtexture and nanostructure suits electrochemical applications. Here, covalent organic nanosheets (CON) with nanopores lined with triazole and phloroglucinol units, neither of which binds lithium strongly, and its potential as an anode in Li-ion battery are presented. Their fibrous texture enables facile amalgamation as a coin-cell anode, which exhibits exceptionally high specific capacity of ≈720 mA h g −1 (@100 mA g −1 ). Its capacity is retained even after 1000 cycles. Increasing the current density from 100 mA g −1 to 1 A g −1 causes the specific capacity to drop only by 20%, which is the lowest among all high-performing anodic COFs. The majority of the lithium insertion follows an ultrafast diffusion-controlled intercalation (diffusion coefficient, D Li + = 5.48 × 10 −11 cm 2 s −1 ). The absence of strong Liframework bonds in the density functional theory (DFT) optimized structure supports this reversible intercalation. The discrete monomer of the CON shows a specific capacity of only 140 mA h g −1 @50 mA g −1 and no sign of lithium intercalation reveals the crucial role played by the polymeric structure of the CON in this intercalation-assisted conductivity. The potentials mapped using DFT suggest a substantial electronic driving-force for the lithium intercalation. The findings underscore the potential of the designer CON as anode material for Li-ion batteries. Lithium Storage

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“…High-symmetry precursors are mainly used, and networks synthesized using low-symmetry monomers have been rarely reported on surfaces. 15,24,25 Sierpiński triangle (ST) is a fractal geometrical set with an equilateral triangular shape subdivided recursively into smaller equilateral triangles. Because it possesses a reduced Hausdorff dimension of 1.58, such a pattern is attractive to build nanoscale structures with unique properties.…”

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Covalent organic frameworks from a monomer with reduced symmetry: polymorphism and Sierpiński triangles

et al. 2019

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Simultaneous construction of two linkages for the on-surface synthesis of imine–boroxine hybrid covalent organic frameworks

Abstract: The orthogonality between the Schiff base reaction and the boronic acid dehydration reaction is explored during the on-surface synthesis process.

Cited by 59 publications

References 43 publications

Covalent Organic Frameworks: From Materials Design to Biomedical Application

Covalent Organic Frameworks: From Materials Design to Biomedical Application

High and Reversible Lithium Ion Storage in Self‐Exfoliated Triazole‐Triformyl Phloroglucinol‐Based Covalent Organic Nanosheets

Covalent organic frameworks from a monomer with reduced symmetry: polymorphism and Sierpiński triangles

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