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Issue 39, 2017
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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, and ferroelectric and dielectric properties

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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 types 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, 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 cm−2 and a coercive field (Ec) of 6.5 kV cm−1. Room-temperature and low-temperature phases of 1 featured the same topology structure of {34·46·517·616·72}. Compound 2 underwent a paraelectric–paraelectric phase transition from room-temperature-phase I4/mmm to low-temperature-phase Cmcm at Tt ≈ 177 K. Moreover, this study contributes to a deeper understanding of the structure–property relationship in emerging metal–organic ferroelectrics.

Graphical abstract: Two novel metal–organic coordination polymers based on ligand 1,4-diazabicyclo[2.2.2]octane N,N′-dioxide with phase transition, and ferroelectric and dielectric properties

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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, 2017,19, 5907-5914
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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, and ferroelectric and dielectric properties

    L. Chen, Q. Ji, X. Wang, Q. Pan, X. Cao and G. Xu, CrystEngComm, 2017, 19, 5907
    DOI: 10.1039/C7CE00964J

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