Ferroelastic Phase Transition and Switchable Dielectric Constant in Heterometallic Niccolite Formate Frameworks

Four heterometallic formate frameworks templated by various alkylamine cations with the general formula [cat]­[GaIIIMnII(HCOO)6] {cat is MA (CH3NH3 +) for 1, DMA [(CH3)2NH2 +] for 2, EtA (CH3CH2NH3 +) for 3, and DEtA [(CH3CH2)2NH2 +] for 4} have been prepared and characterized by X-ray diffraction,...

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Published in:Inorganic chemistry 2018-01, Vol.57 (2), p.537-540
Main Authors: Wang, Kai, Xiong, Jian-Bo, Xia, Bin, Wang, Qing-Lun, Tong, Yu-Zhang, Ma, Yue, Bu, Xian-He
Format: Article
Language:English
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Summary:Four heterometallic formate frameworks templated by various alkylamine cations with the general formula [cat]­[GaIIIMnII(HCOO)6] {cat is MA (CH3NH3 +) for 1, DMA [(CH3)2NH2 +] for 2, EtA (CH3CH2NH3 +) for 3, and DEtA [(CH3CH2)2NH2 +] for 4} have been prepared and characterized by X-ray diffraction, differential scanning calorimetry, and dielectric studies. All of the complexes have niccolite-like structures, which possess the same [GaMn­(HCOO)6]− anionic framework with binodal (412·63)­(49·66) topology; only the counterions in the cavity are different. Complex 4 undergoes a reversible ferroelastic phase transition around 220 K accompanied by a thermally switchable dielectric constant transition triggered by the freezing of the order–disorder DEtA cations.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.7b02386