In Situ Encapsulation of Imidazolium Proton Carriers in Anionic Open Frameworks Leads the Way to Proton-Conducting Materials

Kangcai Wang; Xiujuan Qi; Zhi Wang; Ruihao Wang; Jie Sun; Qinghua Zhang

doi:10.1002/ejic.201700157

In Situ Encapsulation of Imidazolium Proton Carriers in Anionic Open Frameworks Leads the Way to Proton-Conducting Materials

Kangcai Wang
, Xiujuan Qi
, Zhi Wang
, Ruihao Wang
, Jie Sun
, Qinghua Zhang

China Academy of Engineering Physics
Sichuan Co-Innovation Center for Energetic Materials
Southwest University of Science and Technology

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

13 Scopus citations

Abstract

Three anionic open frameworks, formulated as [Him]₂Eu₂(ox)₄(H₂O)₂·2H₂O (1), [Him]₂Tb₂(ox)₄(H₂O)₂·2H₂O (2), and [Hmim]₂Eu₂(ox)₄(H₂O)₂·2H₂O (3; ox = oxalate, im = imidazole, mim = methylimidazole), have been synthesized by a solvent-free method. In these solvent-free processes, in situ encapsulation of imidazolium in the channels of the anionic open frameworks was successfully achieved. These compounds show 1D channels with extensive hydrogen-bonding networks created between the guest molecules and adjacent oxalate oxygen atoms; the imidazolium or methylimidazolium cations are regularly arranged within the channels. Alternating current (AC) impedance measurements revealed that the three compounds display high proton conductivities (>10^–3 S cm^–1) at 298 K and 98 % relative humidity, with compound 2 showing the highest proton conductivity of 5.0 × 10^–3 S cm^–1 at 298 K. The high proton conductivities of compounds 1–3 may be attributed to the extensive hydrogen-bonding networks existing in the open frameworks, which are constructed by water molecules, protonated imidazole or methylimidazole molecules, and adjacent oxalate oxygen atoms. This work provides an efficient synthetic strategy for the construction of high-performance solid proton conductors.

Original language	English
Pages (from-to)	2295-2300
Number of pages	6
Journal	European Journal of Inorganic Chemistry
Volume	2017
Issue number	16
DOIs	https://doi.org/10.1002/ejic.201700157
State	Published - 26 Apr 2017
Externally published	Yes

Keywords

Conducting materials
Hydrogen bonds
Metal-organic frameworks
Proton transport
X-ray diffraction

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10.1002/ejic.201700157

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title = "In Situ Encapsulation of Imidazolium Proton Carriers in Anionic Open Frameworks Leads the Way to Proton-Conducting Materials",

abstract = "Three anionic open frameworks, formulated as [Him]2Eu2(ox)4(H2O)2·2H2O (1), [Him]2Tb2(ox)4(H2O)2·2H2O (2), and [Hmim]2Eu2(ox)4(H2O)2·2H2O (3; ox = oxalate, im = imidazole, mim = methylimidazole), have been synthesized by a solvent-free method. In these solvent-free processes, in situ encapsulation of imidazolium in the channels of the anionic open frameworks was successfully achieved. These compounds show 1D channels with extensive hydrogen-bonding networks created between the guest molecules and adjacent oxalate oxygen atoms; the imidazolium or methylimidazolium cations are regularly arranged within the channels. Alternating current (AC) impedance measurements revealed that the three compounds display high proton conductivities (>10–3 S cm–1) at 298 K and 98 \% relative humidity, with compound 2 showing the highest proton conductivity of 5.0 × 10–3 S cm–1 at 298 K. The high proton conductivities of compounds 1–3 may be attributed to the extensive hydrogen-bonding networks existing in the open frameworks, which are constructed by water molecules, protonated imidazole or methylimidazole molecules, and adjacent oxalate oxygen atoms. This work provides an efficient synthetic strategy for the construction of high-performance solid proton conductors.",

keywords = "Conducting materials, Hydrogen bonds, Metal-organic frameworks, Proton transport, X-ray diffraction",

author = "Kangcai Wang and Xiujuan Qi and Zhi Wang and Ruihao Wang and Jie Sun and Qinghua Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim",

year = "2017",

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T1 - In Situ Encapsulation of Imidazolium Proton Carriers in Anionic Open Frameworks Leads the Way to Proton-Conducting Materials

AU - Wang, Kangcai

AU - Qi, Xiujuan

AU - Wang, Zhi

AU - Wang, Ruihao

AU - Sun, Jie

AU - Zhang, Qinghua

PY - 2017/4/26

Y1 - 2017/4/26

N2 - Three anionic open frameworks, formulated as [Him]2Eu2(ox)4(H2O)2·2H2O (1), [Him]2Tb2(ox)4(H2O)2·2H2O (2), and [Hmim]2Eu2(ox)4(H2O)2·2H2O (3; ox = oxalate, im = imidazole, mim = methylimidazole), have been synthesized by a solvent-free method. In these solvent-free processes, in situ encapsulation of imidazolium in the channels of the anionic open frameworks was successfully achieved. These compounds show 1D channels with extensive hydrogen-bonding networks created between the guest molecules and adjacent oxalate oxygen atoms; the imidazolium or methylimidazolium cations are regularly arranged within the channels. Alternating current (AC) impedance measurements revealed that the three compounds display high proton conductivities (>10–3 S cm–1) at 298 K and 98 % relative humidity, with compound 2 showing the highest proton conductivity of 5.0 × 10–3 S cm–1 at 298 K. The high proton conductivities of compounds 1–3 may be attributed to the extensive hydrogen-bonding networks existing in the open frameworks, which are constructed by water molecules, protonated imidazole or methylimidazole molecules, and adjacent oxalate oxygen atoms. This work provides an efficient synthetic strategy for the construction of high-performance solid proton conductors.

AB - Three anionic open frameworks, formulated as [Him]2Eu2(ox)4(H2O)2·2H2O (1), [Him]2Tb2(ox)4(H2O)2·2H2O (2), and [Hmim]2Eu2(ox)4(H2O)2·2H2O (3; ox = oxalate, im = imidazole, mim = methylimidazole), have been synthesized by a solvent-free method. In these solvent-free processes, in situ encapsulation of imidazolium in the channels of the anionic open frameworks was successfully achieved. These compounds show 1D channels with extensive hydrogen-bonding networks created between the guest molecules and adjacent oxalate oxygen atoms; the imidazolium or methylimidazolium cations are regularly arranged within the channels. Alternating current (AC) impedance measurements revealed that the three compounds display high proton conductivities (>10–3 S cm–1) at 298 K and 98 % relative humidity, with compound 2 showing the highest proton conductivity of 5.0 × 10–3 S cm–1 at 298 K. The high proton conductivities of compounds 1–3 may be attributed to the extensive hydrogen-bonding networks existing in the open frameworks, which are constructed by water molecules, protonated imidazole or methylimidazole molecules, and adjacent oxalate oxygen atoms. This work provides an efficient synthetic strategy for the construction of high-performance solid proton conductors.

KW - Conducting materials

KW - Hydrogen bonds

KW - Metal-organic frameworks

KW - Proton transport

KW - X-ray diffraction

UR - https://www.scopus.com/pages/publications/85018922439

U2 - 10.1002/ejic.201700157

DO - 10.1002/ejic.201700157

M3 - 文章

AN - SCOPUS:85018922439

SN - 1434-1948

VL - 2017

SP - 2295

EP - 2300

JO - European Journal of Inorganic Chemistry

JF - European Journal of Inorganic Chemistry

IS - 16

ER -

In Situ Encapsulation of Imidazolium Proton Carriers in Anionic Open Frameworks Leads the Way to Proton-Conducting Materials

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Keywords

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