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Switchable dielectric phase transition behaviors in two organic-inorganic copper(II) halides with distinct coordination geometries

Abstract

Two new organic-inorganic chlorocuprates(II), [(ClCH2)(CH3)3N]2CuCl4 (1) which contains discrete [CuCl4]2- tetrahedron, and [(ClCH2)(CH3)3N]CuCl3 (2) which comprises one-dimensional [CuCl3]- chains of edge-sharing CuCl5 pyramid, have been synthesized. Compound 1 exhibits a symmetry breaking phase transition at 335.2 K, while 2 undergoes an isostructural phase transition at 333.8 K, as disclosed by differential scanning calorimetry measurements and variable-temperature X-ray diffraction analyses. The dielectric measurements reveal that both compounds 1 and 2 show prominent switchable dielectric activities between high and low dielectric states in the vicinity of phase transition temperature. In addition, the contrast between the two dielectric states in 1 is much higher than that in 2, which is related to the more remarkable dynamic change of [(ClCH2)(CH3)3N]+ cation in 1 during the phase transition process. It is believed that this work will pave a new avenue to design multifunctional phase transition materials by exploring the area of Cu2+ based organic-inorganic metal halides.

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Publication details

The article was received on 29 Jul 2018, accepted on 03 Sep 2018 and first published on 03 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01263F
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Switchable dielectric phase transition behaviors in two organic-inorganic copper(II) halides with distinct coordination geometries

    Y. Mei, X. Hua, J. Gao and W. Liao, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01263F

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