<scp>Lanthanide‐Hypophosphite</scp> Frameworks with Guanidinium Guest Showing High Proton Conductivity

Li, Quanwen; Li, Zhaoyang; Li, Kai; Xia, Bin; Li, Na; Bu, Xian‐He

doi:10.1002/cjoc.202100382

Cited by 3 publications

(2 citation statements)

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“…In the past studies, the cage perovskites family emerge with many switching dielectric materials. For exemple, the linear ligand halide ion, CN – , N(CN) 2 – , N 3 – , etc ., [ 15‐19 ] and the polyhedron ligand COOH – , H 2 POO – , ClO 4 – , BF 4 – , ReO 4 – , etc ., formed the cage compounds, [ 20‐23 ] in which some special materials exhibit ferroelectric or ferroelastic properties such as MDABCO–NH 4 I 3 , [ 24 ] [(CH 3 ) 3 NOH] 2 [KFe(CN) 6 ], [ 25 ] and (azetidinium)[Zn(HCOO) 3 ]. [ 26 ] The guest cations in these cage perovskite show quasi‐spherical geometry in the ordered state and spherical geometry in a highly disordered state, which provides the possibility for their symmetry breaking to induce ferroelectric or ferroelastic performance.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Hydrogen‐Bonded Engineering Enhancing Phase Transition Temperature in Molecular Perovskite Ferroelastic

Zhang

Ding

et al. 2022

Chin. J. Chem.

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Comprehensive Summary The broad operating temperature range is sought for molecular ferroic materials who are expected to be applied to flexible and electronic materials. Hydrogen bonds, an effective force between molecules, are important to regulate the molecule structure and their condition, helping a higher temperature range for ferroic materials. Here, we report a molecular perovskite ferroelastic (Me‐Hdabco)Rb[BF4]3 (Me‐Hdabco = N‐methyldabconium) which shows high temperature (T1 = 322.5 K and T2 = 381 K) ferroelastic phase transitions. The ferroelastic phase transition temperature range of (Me‐Hdabco)Rb[BF4]3 is significantly increased by 71 K compared with [Meda‐bco‐F]Rb[BF4]3 (Medabco‐F = 1‐fluoro‐4‐methyl‐1,4‐diazoniabicyclo[2.2.2]octane). Structural analysis and thermal analysis demonstrate the ferroelastic phase transition is mainly attributed to dynamic cations order and disorder transformation. Therefore, new hydrogen bonds generated between cations and the Rb8[BF4]12 frame increase their intermolecular force, which is beneficial to improving the phase transition temperature. This finding has an important impact on the utilization of weak interaction forces to design and optimize functional materials.

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Section: Background and Originality Contentmentioning

confidence: 99%

Hydrogen‐Bonded Engineering Enhancing Phase Transition Temperature in Molecular Perovskite Ferroelastic

Zhang

Ding

et al. 2022

Chin. J. Chem.

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“…Metal‐ organic framework (MOF) [ 3 ] as a shining crystalline material is getting more and more attention and development in the field of MAMs. Before this, MOF is usually applied in gas separation and adsorption, [ 4 ] catalysis, [ 5 ] electrocatalysis, [ 6 ] proton conductivity, [ 7 ] dielectric substrates. [ 8 ] MOF‐based MAMs display excellent advantages in broadening the effective absorption width, enhancing microwave absorption ability, and reducing the density and thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Review and Perspective of Tailorable Metal‐Organic Framework for Enhancing Microwave Absorption

Miao

Chen

et al. 2023

Chin. J. Chem.

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Comprehensive Summary Metal‐organic frameworks (MOFs) and their pyrolytic derivates, displaying diverse chemical compositions and microstructures, provide the infinite potential for preparing high‐performance microwave absorption materials (MAMs) and have attracted extensive attention. In this review, we systematically reviewed the recent progress of MOF‐based MAMs, including three types of MOF‐based MAMs (MOF‐derived metal/carbon nanocomposites, MOF‐based hybridization materials and conductive MOF). Besides that, the microwave absorption properties and their related physical and chemical appearance were also analyzed. On behalf of synergistic effects between microstructures, dielectric components and magnetic response, the MOF‐based MAMs show excellent microwave absorption performance, which is superior to that of traditional single metal, metal alloy and pure carbon‐based MAMs. Furthermore, the novel conductive MOF with tunable electrical conductivity shows great potential in MAMs due to the fact that it can dramatically simplify the synthesis process.

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Two Novel Three‐Dimensional Tetraphenylethylene‐Based Rare Earth MOFs with Ultra‐High Proton Conductivity and Performance Stability

Wang

Zhao

Sun

et al. 2022

Chemistry A European J

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In this work, the two example rare earth-based metal-organic frameworks (La III -based MOFs), Eu-ETTB and Gd-ETTB, were obtained by self-assembly. Both materials showed extremely high proton conductivity, with the proton conductivity of Eu-ETTB being 1.53 × 10 À 2 S cm À 1 at 98 % relative humidity (RH) and 85 °C and that of Gd-ETTB being 2.63 × 10 À 2 S cm À 1 at 98 % RH and 75 °C. This was almost the best performance observed for three-dimensional porous MOFs without post-synthetic modification and was based on milder conditions than for most materials. Furthermore, cycle test experiments and continuous work tests showed that both materials had excellent performance both in terms of stability and durability. Water vapor adsorption experiments showed that a large number of water molecules are adsorbed the hydrogen-bond network's being rebuilt by the adsorbed water molecules in the pore channel and thus optimizing the channels for proton transfer explained the MOF's high performance.

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Lanthanide‐Hypophosphite Frameworks with Guanidinium Guest Showing High Proton Conductivity

Cited by 3 publications

References 46 publications

Hydrogen‐Bonded Engineering Enhancing Phase Transition Temperature in Molecular Perovskite Ferroelastic

Hydrogen‐Bonded Engineering Enhancing Phase Transition Temperature in Molecular Perovskite Ferroelastic

Review and Perspective of Tailorable Metal‐Organic Framework for Enhancing Microwave Absorption

Two Novel Three‐Dimensional Tetraphenylethylene‐Based Rare Earth MOFs with Ultra‐High Proton Conductivity and Performance Stability

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