Ferroelastic Phase Transition and Switchable Dielectric Constant in Heterometallic Niccolite Formate Frameworks
Ferroelastic Phase Transition and Switchable Dielectric Constant in Heterometallic Niccolite Formate Frameworks
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异金属镍钴矿甲酸盐骨架中的铁弹性相变和可切换介电常数
DOI：
10.1021/acs.inorgchem.7b02386
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发表时间：
2018
影响因子：
4.6
通讯作者：
Bu Xian-He
中科院分区：
文献类型：
--
作者：
Wang Kai;Xiong Jian-Bo;Xia Bin;Wang Qing-Lun;Tong Yu-Zhang;Ma Yue;Bu Xian-He
合成了四种以不同烷基胺阳离子为模板的甲酸异金属盐骨架化合物[cat][GaIIIMnII（HCOO）6] {cat为MA（CH 3 NH3+）for 1，DMA [（CH 3）2NH 2 +] for 2，EtA（CH 3CH 2NH 3+）for 3，DEtA [（CH 3CH 2）2NH 2 +] for 4}，并通过X射线衍射、差示扫描量热法和介电性能研究对其进行了表征.所有配合物都具有镍钴酸盐结构，具有相同的[GaMn（HCOO）6]−阴离子骨架，具有双节点（412·63）（49·66）拓扑结构;只有空腔中的抗衡离子不同。配合物4在220 K附近发生可逆的铁弹相变，并伴随着由有序-无序DEtA阳离子的冻结引发的可热切换的介电常数转变.
Four heterometallic formate frameworks templated by various alkylamine cations with the general formula [cat][GaIIIMnII(HCOO)6] {cat is MA (CH3NH3+) for1, DMA [(CH3)2NH2+] for2, EtA (CH3CH2NH3+) for3, and DEtA [(CH3CH2)2NH2+] for4} 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. Complex4undergoes 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.