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Two Novel Metal-Organic Coordination Polymers Based on Ligand 1,4-Diazabicyclo[2.2.2]octane N,N’-dioxide with Phase Transition, Ferroelectric and Dielectric Properties

Abstract

Two novel metal-organic complexes {[Ag3(dabcodo)(NO3)3]•H2O}n (1) and [Ca(Dabcodo)(H2O)4Cl2]n (2) containing metal salt and 1,4-diazabicyclo[2.2.2]octane N,N’-dioxide (dabcodo), in which dabcodo is coordinated with two kinds of metal ions were successfully synthesized. Differential scanning calorimetry, powder X-ray diffraction, variable-temperature structural analyses, dielectric measurements and rectangular polarization−electric field hysteresis loops revealed that 1 underwent phase transition from room temperature phase Pca21 to low temperature phase Cc at Tt ≈ 217 K as well as 2 at Tt ≈176 K, accompanied by remarkable dielectric relaxation. Compound 1 was a typical ferroelectric-ferroelectric phase transition material with an electric hysteresis loop showing a remnant polarization (Pr) of ca. 0.23 μC/cm2 and a coercive field (Ec) of 6.5 kV/cm. Room temperature phase and low temperature phase of 1 featured the same topology structure of {34.46.517.616.72}. 2 underwent a paraelectric-paraelectric phase transition. Moreover, this study contributes to a deeper understanding of the structure−property relationship in emerging metal-organic ferroelectrics.

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Publication details

The article was received on 21 May 2017, accepted on 03 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE00964J
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Two Novel Metal-Organic Coordination Polymers Based on Ligand 1,4-Diazabicyclo[2.2.2]octane N,N’-dioxide with Phase Transition, Ferroelectric and Dielectric Properties

    L. chen, Q. Ji, Q. Pan, X. Cao and G. Xu, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00964J

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