Dielectric anomaly and relaxation natures in a Zn-Cr pillar−layered metal−organic framework with cages and channels

Chen Xue; Zhi Yuan Yao; Shao Xian Liu; Hong Bin Luo; Yang Zou; Li Li; Xiao Ming Ren

doi:10.1016/j.jssc.2017.03.029

Dielectric anomaly and relaxation natures in a Zn-Cr pillar−layered metal−organic framework with cages and channels

Chen Xue, Zhi Yuan Yao, Shao Xian Liu, Hong Bin Luo, Yang Zou, Li Li, Xiao Ming Ren

School of Chemistry and Moleculai Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A bimetallic metal–organic framework (MOF) with the formula [Zn₃btc₂{Cr₃O(isonic)₆(H₂O)₂(OH)}]·(DMF)_15.5(H₂O)₈ (H₃btc=1,3,5-benzenetricarboxylic acid; isonic=isonicotinicate) shows a pillar-layered structure. The monolayer consists of hexagon-like rings formed by the [Zn(isonic)₂(btc)₂] tetrahedral and the consecutive monolayers are pillared by trigonal–prismatic clusters of [Cr₃O(isonic)₆(H₂O)₂(OH)]through the remaining binding sites of the Zn²⁺ ions. DMF and water molecules are confined in the cages and channels. TGA indicates that the lattice DMF and water molecules begin to be released at temperatures above 363 K. Dielectric measurements were carried out in the range of 173–363 K and 1–10⁷ Hz for three successive thermal cycles. The dielectric spectroscopy obtained in the first thermal cycle was different from that observed in the next two thermal cycles, while the dielectric spectra in the last two thermal cycles were almost identical. The dielectric nature of this MOF is discussed in detail for each thermal cycle. Since MOFs are unique host–guest systems in which the structure of the host framework is designable and the guests are exchangeable, it is no doubt those MOFs are materials with a variety of dielectric natures. This study gives a fresh impetus to achieve MOFs–based dielectric materials.

Original language	English
Pages (from-to)	107-113
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	250
DOIs	https://doi.org/10.1016/j.jssc.2017.03.029
State	Published - 1 Jun 2017

Keywords

Bimetallic MOF
Dielectric anomaly
Dielectric relaxation
Pillar-layered framework

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10.1016/j.jssc.2017.03.029

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@article{57808aac121e4217b8c70f7bcb9ca988,

title = "Dielectric anomaly and relaxation natures in a Zn-Cr pillar−layered metal−organic framework with cages and channels",

abstract = "A bimetallic metal–organic framework (MOF) with the formula [Zn3btc2{Cr3O(isonic)6(H2O)2(OH)}]·(DMF)15.5(H2O)8 (H3btc=1,3,5-benzenetricarboxylic acid; isonic=isonicotinicate) shows a pillar-layered structure. The monolayer consists of hexagon-like rings formed by the [Zn(isonic)2(btc)2] tetrahedral and the consecutive monolayers are pillared by trigonal–prismatic clusters of [Cr3O(isonic)6(H2O)2(OH)]through the remaining binding sites of the Zn2+ ions. DMF and water molecules are confined in the cages and channels. TGA indicates that the lattice DMF and water molecules begin to be released at temperatures above 363 K. Dielectric measurements were carried out in the range of 173–363 K and 1–107 Hz for three successive thermal cycles. The dielectric spectroscopy obtained in the first thermal cycle was different from that observed in the next two thermal cycles, while the dielectric spectra in the last two thermal cycles were almost identical. The dielectric nature of this MOF is discussed in detail for each thermal cycle. Since MOFs are unique host–guest systems in which the structure of the host framework is designable and the guests are exchangeable, it is no doubt those MOFs are materials with a variety of dielectric natures. This study gives a fresh impetus to achieve MOFs–based dielectric materials.",

keywords = "Bimetallic MOF, Dielectric anomaly, Dielectric relaxation, Pillar-layered framework",

author = "Chen Xue and Yao, {Zhi Yuan} and Liu, {Shao Xian} and Luo, {Hong Bin} and Yang Zou and Li Li and Ren, {Xiao Ming}",

note = "Publisher Copyright: {\textcopyright} 2017",

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doi = "10.1016/j.jssc.2017.03.029",

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T1 - Dielectric anomaly and relaxation natures in a Zn-Cr pillar−layered metal−organic framework with cages and channels

AU - Xue, Chen

AU - Yao, Zhi Yuan

AU - Liu, Shao Xian

AU - Luo, Hong Bin

AU - Zou, Yang

AU - Li, Li

AU - Ren, Xiao Ming

PY - 2017/6/1

Y1 - 2017/6/1

N2 - A bimetallic metal–organic framework (MOF) with the formula [Zn3btc2{Cr3O(isonic)6(H2O)2(OH)}]·(DMF)15.5(H2O)8 (H3btc=1,3,5-benzenetricarboxylic acid; isonic=isonicotinicate) shows a pillar-layered structure. The monolayer consists of hexagon-like rings formed by the [Zn(isonic)2(btc)2] tetrahedral and the consecutive monolayers are pillared by trigonal–prismatic clusters of [Cr3O(isonic)6(H2O)2(OH)]through the remaining binding sites of the Zn2+ ions. DMF and water molecules are confined in the cages and channels. TGA indicates that the lattice DMF and water molecules begin to be released at temperatures above 363 K. Dielectric measurements were carried out in the range of 173–363 K and 1–107 Hz for three successive thermal cycles. The dielectric spectroscopy obtained in the first thermal cycle was different from that observed in the next two thermal cycles, while the dielectric spectra in the last two thermal cycles were almost identical. The dielectric nature of this MOF is discussed in detail for each thermal cycle. Since MOFs are unique host–guest systems in which the structure of the host framework is designable and the guests are exchangeable, it is no doubt those MOFs are materials with a variety of dielectric natures. This study gives a fresh impetus to achieve MOFs–based dielectric materials.

AB - A bimetallic metal–organic framework (MOF) with the formula [Zn3btc2{Cr3O(isonic)6(H2O)2(OH)}]·(DMF)15.5(H2O)8 (H3btc=1,3,5-benzenetricarboxylic acid; isonic=isonicotinicate) shows a pillar-layered structure. The monolayer consists of hexagon-like rings formed by the [Zn(isonic)2(btc)2] tetrahedral and the consecutive monolayers are pillared by trigonal–prismatic clusters of [Cr3O(isonic)6(H2O)2(OH)]through the remaining binding sites of the Zn2+ ions. DMF and water molecules are confined in the cages and channels. TGA indicates that the lattice DMF and water molecules begin to be released at temperatures above 363 K. Dielectric measurements were carried out in the range of 173–363 K and 1–107 Hz for three successive thermal cycles. The dielectric spectroscopy obtained in the first thermal cycle was different from that observed in the next two thermal cycles, while the dielectric spectra in the last two thermal cycles were almost identical. The dielectric nature of this MOF is discussed in detail for each thermal cycle. Since MOFs are unique host–guest systems in which the structure of the host framework is designable and the guests are exchangeable, it is no doubt those MOFs are materials with a variety of dielectric natures. This study gives a fresh impetus to achieve MOFs–based dielectric materials.

KW - Bimetallic MOF

KW - Dielectric anomaly

KW - Dielectric relaxation

KW - Pillar-layered framework

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DO - 10.1016/j.jssc.2017.03.029

M3 - 文章

AN - SCOPUS:85016724594

SN - 0022-4596

VL - 250

SP - 107

EP - 113

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

ER -

Dielectric anomaly and relaxation natures in a Zn-Cr pillar−layered metal−organic framework with cages and channels

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Keywords

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