Atmospheric humidity-triggered reversible spin-state switching

Luo, Yang‐Hui; Dong, Hui; Ma, Shuhua; Zeng, Feng‐Lian; Jin, Xue‐Ting; Liu, Min

doi:10.1039/d2ta08632h

Cited by 15 publications

(10 citation statements)

References 43 publications

(57 reference statements)

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“…When DTBPT is incorporated into the moisture-captured network, the resulting solid-state materials are developed as humidity switches. On the other hand, our previous research has shown that polyethylene glycol-modified poly vinylidene fluoride gel can act as good material support for its rapid humidity transport and excellent molding ability. – Combining the merits of DTBPT and PVDF gel, a sensitive humidity switching could be developed by embedding DTBPT molecules into a polymer frame. First of all, we dispersed different amounts of DTBPT into PVDF gel to form a mixture of DTBPT@gel (weight ratio by PVDF = 2, 5, and 10%).…”

Section: Resultsmentioning

confidence: 99%

Humidity-Driven Color-Fluorescence Dual Switching of Naphthalenediimide Aggregates

Zeng,

Jin,

Zhang

et al. 2023

Crystal Growth & Design

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Numerous emerging applications require precise monitoring of humidity that is not only sensitive and miniaturized but also durable and portable. However, except for the existing sensing mechanisms, such as resistive, capacitive, impedance, and voltage-based devices, little attention has been paid to exploiting dual readout modes with novel properties that can meet the requirements of simplicity and convenience. In this work, an example of color/fluorescence dual-switching by using an aggregator building block of naphthalenediimide with a porous hygroscopic polymer matrix is proposed. With an increase in the water fraction, there are obvious variations in fluorescence, driven by H-aggregation of the aggregator, and in color, driven by intramolecular-charge transfer, which facilitate the monitoring of external humidity. More importantly, the prepared humidity-sensitive switch demonstrated excellent cycling stability and reversibility. This work may shed light on the precise fabrication of aggregation-activated materials for potential applications in humidity-sensitive systems and switching devices.

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Section: Resultsmentioning

confidence: 99%

Humidity-Driven Color-Fluorescence Dual Switching of Naphthalenediimide Aggregates

Zeng,

Jin,

Zhang

et al. 2023

Crystal Growth & Design

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“…From the viewpoint of practical applications, the solid-state SSS is more attractive. We then set our attention to the 3D porous hydrophilic sponge reported in our recent work. − The sponge was composed of a rigid polyvinylidene fluoride framework and a super hygroscopic material and is capable of capturing humidity effectively for all weather conditions, which shows high potential to perform water-triggered LS to HS switching of Fe(NCS) 2 ( L -C 2 H 5 ) 2 on the sponge state via atmospheric humidity capture under all weather conditions. The integration was carried out by immersing the sponge in DMF suspensions of Fe(NCS) 2 ( L -C 2 H 5 ) 2 overnight, resulting in a hybrid Fe@Sponge (Figure a).…”

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 related sponge was composed of the hydrophobic polymer PVDF and polyethylene glycol (PEG), which could be utilized as a 3D bracket to further promote the SCO distribution. [ 40 ] The PVDF gel could improve stability and ensure good dispersibility of the functional materials due to the soft space formed by the low‐viscosity oligomer. Therefore, it is expected to combine with PCSSs to enable efficient photoreversible color switching.…”

Section: Introductionmentioning

confidence: 99%

Rewritable Paper Based on Layered Metal–Organic Frameworks with NIR‐Triggered Reversible Color Switching

Liu

Dong

et al. 2023

Advanced Optical Materials

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color-switching property of Prussian Blue and its analogs with the photocatalytic activity of TiO 2 nanoparticles, which have excellent scalability and outstanding rewriting performance. Additionally, the Li group has reported AgI/CsPbI 3 rewritable platform by using a reversible fluorescence switching of CsPbI 3 nanocrystals (NCs) and photochromic AgI NCs as the photosensitizer. The AgI NCs have decomposed into Ag and I 2 to form Ag-CsPbI 3 heterostructures under light irradiation, while Ag has oxidized into AgI to

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Atmospheric humidity-triggered reversible spin-state switching

Abstract: The practical application of molecular switches was highly dependent on the reversible spin-state switching under ambient conditions, which needs a delicate materials design. Here, by confining spin-crossover material into a...

Cited by 15 publications

References 43 publications

Humidity-Driven Color-Fluorescence Dual Switching of Naphthalenediimide Aggregates

Humidity-Driven Color-Fluorescence Dual Switching of Naphthalenediimide Aggregates

Dynamic Aggregation Triggering Reversible Spin-State Switching

Rewritable Paper Based on Layered Metal–Organic Frameworks with NIR‐Triggered Reversible Color Switching

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