Rapid Microwave Synthesis and Purification of Porous Covalent Organic Frameworks

Campbell, Neil; Clowes, Rob; Ritchie, Lyndsey K.; Cooper, Andrew I.

doi:10.1021/cm802981m

Cited by 391 publications

(263 citation statements)

References 21 publications

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“…47,48 These attributes, along with higher product yields and improved chemical selectivity, make microwave assisted techniques inherently green compared to conventional heating techniques. The use of microwave energy to heat and drive chemical reactions is growing at a rapid rate, with new and innovative applications in material sciences, [49][50][51] and nanotechnology. 52,53 Irradiation of a semiconductor with light of energy equal to or larger than the bandgap energy leads to the generation of electron-hole pairs, which can subsequently induce redox reactions on the semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation

Gracia

Longo

Cavalcante

et al. 2011

Journal of Applied Physics

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By combining experimental techniques such as x-ray diffraction, Fourier transform Raman, ultraviolet-visible, x-ray absorption near edge structure, extended x-ray absorption fine structure spectroscopy, and theoretical models, a general approach to understand the relationship among photoluminescence (PL) emissions and excited electronic states in CaWO 4 crystals is presented. First-principles calculations of model systems point out that the presence of stable electronic excited states (singlet) allow us to propose one specific way in which PL behavior can be achieved. In light of this result, we reexamine prior experiments on PL emissions of CaWO 4 .

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Section: Introductionmentioning

confidence: 99%

Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation

Gracia

Longo

Cavalcante

et al. 2011

Journal of Applied Physics

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“…1b using a trivalent 1,3,5-triazine connecting group. 2D COFs can now be synthesized using dynamic covalent chemistry in milligram quantities 9 organic monomers, with solvothermal 10 , microwave 11,12 and ionothermal 13,14 synthesis in solution or directly as monolayers on metallic 15 and graphitic 16,17 substrates. Solution-based monoand few-layer sheets can now be produced at micron diameters, highly crystalline 18 and largely defect-free 19 .…”

mentioning

confidence: 99%

Dirac Cones in two-dimensional conjugated polymer networks

et al. 2014

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Linear electronic band dispersion and the associated Dirac physics has to date been limited to special-case materials, notably graphene and the surfaces of three-dimensional (3D) topological insulators. Here we report that it is possible to create two-dimensional fully conjugated polymer networks with corresponding conical valence and conduction bands and linear energy dispersion at the Fermi level. This is possible for a wide range of polymer types and connectors, resulting in a versatile new family of experimentally realisable materials with unique tuneable electronic properties. We demonstrate their stability on substrates and possibilities for doping and Dirac cone distortion. Notably, the cones can be maintained in 3D-layered crystals. Resembling covalent organic frameworks, these materials represent a potentially exciting new field combining the unique Dirac physics of graphene with the structural flexibility and design opportunities of organic-conjugated polymer chemistry.

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“…Cooper and coworkers prepared porous covalent organic frameworks (COFs) from a 3:2 molar ratio solution of 1,4-benzenediboronic acid (BDBA) and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) in a 1:1 mixture of mesitylene and 1,4-dioxane. [83] The mixture was sealed under an inert atmosphere of nitrogen and exposed to microwave irradiation in a single-mode CEM SClass Explorer microwave reactor at 100 8C for 20 min. It was found that the microwave-assisted synthesis of COFs was about 200 times faster than solvothermal synthesis.…”

Section: Polymerizations Involving Càc Coupling Reactionsmentioning

confidence: 99%

One Decade of Microwave‐Assisted Polymerizations: Quo vadis?

Ebner

Bodner

Stelzer

et al. 2011

Macromol. Rapid Commun.

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The application of microwave irradiation in polymer syntheses and modifications is of continuously growing interest and has received significant international interest since the beginning of the millennium. Preceded by a review that was published 6 years ago, the present paper summarizes the most recent trends in this research area. Radical as well as step-growth and ring-opening polymerizations will be addressed; furthermore, the evolution from microwave-assisted polymerizations to microwave-assisted material fabrication will be described on the examples of polymeranalogous reactions, polymer/metal composites and bio-based materials.

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Rapid Microwave Synthesis and Purification of Porous Covalent Organic Frameworks

Cited by 391 publications

References 21 publications

Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation

Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation

Dirac Cones in two-dimensional conjugated polymer networks

One Decade of Microwave‐Assisted Polymerizations: Quo vadis?

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