Two-dimensional nanosheets of metal–organic frameworks with tailorable morphologies

Luo, Yang‐Hui; Ma, Shuhua; Dong, Hui; Zou, Ya-Chen; Xu, Kexin; Su, Shan; Jin, Xiao-Wei; Zhang, L.; Fang, Wenxia

doi:10.1016/j.mtchem.2021.100517

Cited by 10 publications

(4 citation statements)

References 36 publications

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“…Note that, this color variation can be attributed to the different intermolecular interactions involving the water molecules and 2D surfaces of both hygroscopic and SCO materials. 39–44 Importantly, this color-variation process is reversible, as the yellow-colored species (humidity content of 25%) can return to the blackish-green state, upon humidity release triggered by natural sunlight, which also goes through an intermediate state of green (humidity content of 12%, Fig. 4a).…”

Section: Resultsmentioning

confidence: 99%

Atmospheric humidity-triggered reversible spin-state switching

Luo

Dong

et al. 2023

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Atmospheric humidity-triggered reversible spin-state switching

Luo

Dong

et al. 2023

J. Mater. Chem. A

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“…Figure b shows that compared with L -C 2 H 5 , a 50 nm red shift of the ICT transition from 770 to 820 nm and a 20 nm blue shift of the n -to-π* transition band from 330 to 310 nm have been observed with Fe(NCS) 2 ( L -C 2 H 5 ) 2 . In addition, two new bands centered at 500 and 382 nm have emerged, which can be assigned to the MLCT (metal-to-ligand charge transfer) from the d π orbitals of the Fe(NCS) 2 unit into the π* orbitals of L -C 2 H 5 and d-d transition of the LS state Fe(II) ions, respectively, ,, suggesting the J-aggregated LS state ferrous complex. NIR (808 nm) irradiation on the J-aggregated samples has induced a blue shift of the ICT transition from 820 to 790 nm, accompanied by a slight decrease in the intensity of both the d–d transition and MLCT bands (Figure c), suggesting that the aggregation state has been altered.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Aggregation Triggering Reversible Spin-State Switching

Luo,

Jin,

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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The manipulation of spin-state switching (SSS) under ambient conditions is of significant importance for the construction of molecular switches. Herein, we demonstrate that reversible SSS can be mediated by the aggregation state of a near-infrared (NIR)-sensitive ferrous complex. The ferrous complex was J-aggregated in a DMF suspension and with a low-spin (LS) state; however, with the addition of water, it changed to H-aggregation and reached a high-spin (HS) state, owing to the enhanced intramolecular charge transfer and metal-to-ligand charge transfer. Interestingly, the following NIR irradiation can restore the J-aggregation and LS states owing to the enhanced ligand-to-ligand charge transfer. More interestingly, the ferrous complex can be further incorporated into a hygroscopic sponge that was capable of capturing humidity effectively for all weather conditions, which displayed reversible SSS via alternating atmospheric humidity capture and NIR irradiation under ambient conditions in the sponge state. This study thus opens up a new avenue for the development of novel smart molecular switches at the device level.

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“…The constituent planes of numerous MOF crystals [98,99] are interconnected through weak mutual interactions manifested as hydrogen bonds or van der Waals (vdW) forces. These weak interactions can generally be disrupted by external physical forces [91,92,[100][101][102], thus separating the layers from one another.…”

Section: Top-down Synthesis Mechanical Exfoliationmentioning

confidence: 99%

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

Shen,

Qian,

Lyu

et al. 2023

Applied Sciences

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The escalating urgency to mitigate climate change and enhance energy security has prompted heightened exploration of hydrogen production via electrocatalysis as a viable alternative to conventional fossil fuels. Among the myriad of electrocatalysts under investigation, two-dimensional (2D) metal–organic frameworks (MOFs) stand out as a particularly appealing option. Their unique properties, including a large active specific surface area, distinctive pore structure, ample metal active sites, ultra-thin thickness, superior ion transport efficiency, fast electron transfer rate, and the ability to control the morphological synthesis, endow these frameworks with exceptional versatility and promising potential for electrocatalytic applications. In this review, we delineate the structural features and advantages of 2D MOFs and their derivatives. We proceed to summarize the latest advancements in the synthesis and utilization of these materials for electrocatalytic hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). Finally, we scrutinize the potential and challenges inherent to 2D MOFs and their derivatives in practical applications, underscoring the imperative for continued research in this captivating field of electrocatalysis.

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Two-dimensional nanosheets of metal–organic frameworks with tailorable morphologies

Cited by 10 publications

References 36 publications

Atmospheric humidity-triggered reversible spin-state switching

Atmospheric humidity-triggered reversible spin-state switching

Dynamic Aggregation Triggering Reversible Spin-State Switching

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

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