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

Authors :
Wang, Kangcai
Qi, Xiujuan
Wang, Zhi
Wang, Ruihao
Sun, Jie
Zhang, Qinghua
Source :
European Journal of Inorganic Chemistry. 4/26/2017, Vol. 2017 Issue 16, p2295-2300. 6p.
Publication Year :
2017

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14341948
Volume :
2017
Issue :
16
Database :
Academic Search Index
Journal :
European Journal of Inorganic Chemistry
Publication Type :
Academic Journal
Accession number :
122727787
Full Text :
https://doi.org/10.1002/ejic.201700157