Tuning delamination of layered covalent organic frameworks through structural design

Berlanga, Isadora; Mas‐Ballesté, Rubén; Zamora, Félix

doi:10.1039/c2cc32187d

Cited by 99 publications

(66 citation statements)

References 26 publications

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“…63,64 Thus, in 2013, Bunck and Dichtel reported that 2D hydrazone-linked COFs can be exfoliated into 2D-polymers that assemble organic subunits into covalently linked, high-aspect-ratio networks with longrange order. 63,64 Thus, in 2013, Bunck and Dichtel reported that 2D hydrazone-linked COFs can be exfoliated into 2D-polymers that assemble organic subunits into covalently linked, high-aspect-ratio networks with longrange order.…”

Section: Towards 2d-polymers Based On Cofsmentioning

confidence: 99%

Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications

2016

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Covalent organic-frameworks (COFs) are an emerging class of porous and ordered materials formed by condensation reactions of organic molecules. Recently, the Schiff-base chemistry or dynamic imine-chemistry has been widely explored for the synthesis of COFs. The main reason for this new tendency is based on their high chemical stability, porosity and crystallinity in comparison to previously reported COFs. This critical review article summarizes the current state-of-the-art on the design principles and synthetic strategies toward COFs based on Schiff-base chemistry, collects and rationalizes their physicochemical properties, as well as aims to provide perspectives of potential applications which are at the forefront of research in materials science.

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Section: Towards 2d-polymers Based On Cofsmentioning

confidence: 99%

Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications

2016

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“…Although numerous COF powder exfoliation methods have been reported, very few of these studies demonstrate the ability to reconstitute the resulting nanosheets into large‐area COF films . Most reported methods involve either sonicating the powders in organic solvents or mechanically grinding the powders prior to dispersion, but due to challenges with re‐aggregation and sedimentation at high concentrations, these strategies typically produce dilute suspensions (≤0.2 mg mL −1 ) that are not conducive to large‐scale film fabrication . Although Tsuru and co‐workers demonstrated that thin films can be prepared from a dilute suspension (0.15 mg mL −1 ) of COF‐1 powder prepared through sonication in dichloromethane, the fabrication process required repeated drop‐casting/drying cycles to form a continuous film, and therefore lacks scalability and practicality .…”

Section: Introductionmentioning

confidence: 99%

Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

et al. 2020

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Covalent organic frameworks (COFs) are highly modular porous crystalline polymers that are of interest for applications such as charge‐storage devices, nanofiltration membranes, and optoelectronic devices. COFs are typically synthesized as microcrystalline powders, which limits their performance in these applications, and their limited solubility precludes large‐scale processing into more useful morphologies and devices. We report a general, scalable method to exfoliate two‐dimensional imine‐linked COF powders by temporarily protonating their linkages. The resulting suspensions were cast into continuous crystalline COF films up to 10 cm in diameter, with thicknesses ranging from 50 nm to 20 μm depending on the suspension composition, concentration, and casting protocol. Furthermore, we demonstrate that the film fabrication process proceeds through a partial depolymerization/repolymerization mechanism, providing mechanically robust films that can be easily separated from their substrates.

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“…Polymerization reactions that have the potential to result in robust monolayer macromolecules with laterally extending repeat units have been the subject of numerous studies within the past few years . This concerns both single crystal as well as interfacial approaches using an air/water interface.…”

Section: Introductionmentioning

confidence: 99%

Approaching Two‐Dimensional Copolymers: Photoirradiation of Anthracene‐ and Diaza‐Anthracene‐Bearing Monomers in Langmuir Monolayers

Payamyar

Servalli

Hungerland

et al. 2014

Macromol. Rapid Commun.

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By using structurally similar amphiphilic monomers, it is shown that compressed monolayers of varying amounts of such monomers at the air/water interface can be converted by photo-irradiation into the corresponding covalently connected monolayer sheets. Since one of the monomers carries three anthracene units and the other three 1,8-diaza-anthracene units, the growth reaction is proposed to take place through photochemically achieved [4+4]-cycloaddition between pairs of these units that are co-facially (face-to-face) arranged, to furnish the corresponding covalent dimers. While evidence for both homodimers is amply available, the existence of the heterodimer needs to be established with the help of a model reaction to support the conceptual aspect of this work, copolymerization in two dimensions. The sheet copolymers exhibit substantial robustness in that they can be spanned over 20 × 20 μm(2)-sized holes without rupturing under their own weight. X-ray photoelectron spectroscopy (XPS) studies reveal that the monomers are incorporated into the sheet copolymers according to feed. These results establish existence of the first covalent sheet copolymer, which is considered a step ahead towards novel 2D materials.

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Tuning delamination of layered covalent organic frameworks through structural design

Cited by 99 publications

References 26 publications

Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications

Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications

Acid Exfoliation of Imine‐linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

Approaching Two‐Dimensional Copolymers: Photoirradiation of Anthracene‐ and Diaza‐Anthracene‐Bearing Monomers in Langmuir Monolayers

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