Dual-functional two-dimensional covalent organic frameworks for water sensing and harvesting

Jiang, Shan; Meng, Lingchen; Ma, Wenyue; Pan, Guocui; Zhang, Wei; Zou, Yongcun; Liu, Leijing; Xu, Bin; Tian, Wenjing

doi:10.1039/d1qm00231g

Cited by 64 publications

(32 citation statements)

References 61 publications

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“…32) obtained for the porous organic frameworks are spherical (a), 186 hollow tubes (b), 187 rods (c), 141 flower-like (d), 68 fibre-like (e), 188 thin sheets/films (f), 188 flakes, etc. The unique morphologies showing trepan-like (g) 138 (known as sea cucumber) and bouquet-like (h) 189 structures have also been reported lately.…”

Section: Field Emission Scanning Electron Microscopy (Fesem)mentioning

confidence: 93%

“…49c). 138 For Pythz COF, a distinctive combination of type I and II isotherms is observed indicating both micro and mesoporous nature. On the other and, Pyurea COF shows type I adsorption isotherm indicating purely a microporous structure.…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 94%

“…The other pyrene-based COF, Pythz-COF possess high surface area and good crystallinity and exhibit excellent water sensing and adsorption behavior. 138 To synthesize Pythz-COF, a pyrex tube charged with 1,3,6, 8-tetrakis(p-formylphenyl)pyrene (Py) and terephthalic dihydrazide in a mixture of mesitylene/dioxane (2:1, v/v) with acetic acid as a catalyst was allowed to sonicate for 10 minutes, degassed and then sealed under vacuum to heat at 120 °C for 5 d.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

“…This year, more drastic condition with prolonged time was employed for the synthesis of urea-linked Pyurea COF. 138 The monomers 1,4-phenylenediurea and 1,3,6, 8-tetrakis(pformylphenyl)pyrene (Py) were taken in a Pyrex tube with NMP/AcOH (6M) in 1: 0.1 and was allowed to sonicate for 10 minutes, degassed and then sealed under vacuum to heat at 120 °C for 5 d.…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

“…Moreover, high resolution TEM images (below 20 nm scale) can be obtained from this technique, which gives very detailed and highly magnified surface structures. For example, various COFs with HRTEM images Please do not adjust margins Please do not adjust margins of different morphologies, nanospheres (a), 186 hollow tubes (b and c), 193 nanofilm (d), 188 trepan-like (e) 138 and bouquet-like (f), 189 are shown in Fig. 36.…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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Nitrogen-rich covalent organic frameworks: a promising class of sensory materials

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Section: Field Emission Scanning Electron Microscopy (Fesem)mentioning

confidence: 93%

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 94%

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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Nitrogen-rich covalent organic frameworks: a promising class of sensory materials

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Covalent Organic Frameworks for Atmospheric Water Harvesting

Nguyen

2023

Advanced Materials

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of water in the air varies by location). For direct air cooling, it is applicable in places with high relative humidity (RH). [9] However, in low-humidity air (i.e., arid conditions), the direct air-cooling method is not a good option due to its high energy consumption in cooling the air to the dew point. [10] Water capture assisted by sorbents holds promise because water vapor is concentrated into the pores of the sorbent and pure and drinkable water can subsequently be collected through temperature or pressure swing. [13] This reduces the sensible heat required to cool the air, making this technology applicable in arid conditions. [13] Additionally, the sorbent-assisted water capture eliminates limitations on whether and region, so in principle, it can be applied anywhere and anytime. [14] Covalent organic frameworks (COFs) are one type of reticular materials made up of organic building units that are held together by strong covalent bonds, creating extended structures. [15][16][17][18] The bond energy between the organic building units in COFs is high (300-600 kJ mol −1 ), [19] which makes them more stable than other materials, [20] such as metal-organic frameworks (MOFs), H-bond frameworks, and metal complexes. Being made entirely of organic building units, COFs may be suitable for applications in human life where metal leaching could pose health risks. In addition, COFs are designed by linking pre-synthesized organic units through covalent bonds, enabling the synthesis of targeted frameworks with interesting properties, including porosity and various structure types. [15,17,21,22] These properties make COFs suitable for atmospheric water harvesting, an application that is expected to increase in the future. [23] This article highlights several important features that are required for COF water harvesters and discusses the achievements of using COFs for this purpose. Finally, an outlook for COFs in this research field is provided. Water IsothermsFor physisorption, International Union of Pure and Applied Chemistry classifies six types of sorption isotherms, type I-VI. [24] Type I isotherm represents a very strong interaction between water molecules and the frameworks in narrow micropores, resulting in a maximum amount of water loading into the pore structure at very low RH (0-10% RH). Zeolites, porous oxides, and open metal sites in MOFs can have this type I water isotherm. [23,25] In the chemistry of COFs, water isotherms can be types II, III, IV, and V. [23,26] Type II isotherms Atmospheric water harvesting using reticular materials is an innovation that has the potential to change the world. Using covalent organic frameworks (COFs) for capturing water holds great promise because COFs are metal-free, stable under working conditions, and their structure can be intentionally designed to meet the requirements for this application. To promote the chemistry and use of COFs for atmospheric water harvesting, important features for synthesizing suitable water-harvesting COFs are discussed. The achievements of using ...

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Azatriangulene‐Based Conductive C═C Linked Covalent Organic Frameworks with Near‐Infrared Emission

Hamzehpoor,

Ghamari,

Tao

et al. 2024

Advanced Materials

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Two near‐infrared (NIR) emissive π‐conjugated covalent organic frameworks (COFs) pTANG1 and pTANG2 are synthesized using Knoevenagel condensation of trioxaazatriangulenetricarbaldehyde (TATANG) with benzene‐ and biphenyldiacetonitriles, respectively. The morphology of the COFs is affected by the size of TATANG precursor crystals. Donor–acceptor interactions in these COFs result in small bandgaps (≈1.6 eV) and NIR emission (λmax = 789 nm for pTANG1). pTANG1 can absorb up to 9 molecules of water per unit cell, which is accompanied by a marked quenching of the NIR emission, suggesting applications as humidity sensors. p‐Doping with magic blue significantly increases the electrical conductivities of the COFs by up to 8 orders of magnitude, with the room temperature conductivity of pTANG1 reaching 0.65 S cm−1, the highest among reported C═C linked COFs. 1H NMR relaxometry, temperature‐dependent fluorescence spectroscopy, and DFT calculations reveal that the higher rigidity of the shorter phenylene linker is responsible for the more extended conjugation (red‐shifted emission, higher electrical conductivity) of pTANG1 compared to pTANG2.

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Dual-functional two-dimensional covalent organic frameworks for water sensing and harvesting

Abstract: Two-dimensional covalent organic frameworks (2D COFs) with both water detection and adsorption properties are highly attractive for both basic research and applied research. Herein, we constructed hydrazone-linked Pythz-COF and urea-linked...

Cited by 64 publications

References 61 publications

Nitrogen-rich covalent organic frameworks: a promising class of sensory materials

Nitrogen-rich covalent organic frameworks: a promising class of sensory materials

Covalent Organic Frameworks for Atmospheric Water Harvesting

Azatriangulene‐Based Conductive C═C Linked Covalent Organic Frameworks with Near‐Infrared Emission

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