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Ferroelastic Phase Transition and Switchable Dielectric Constant in Heterometallic Niccolite Formate Frameworks
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02386
Kai Wang 1 , Jian-Bo Xiong 1 , Bin Xia 1 , Qing-Lun Wang 1 , Yu-Zhang Tong 1 , Yue Ma 1 , Xian-He Bu 1
Affiliation  

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.

中文翻译:

杂金属镍钴矿构架中的铁弹性相变和可切换介电常数

通过各种烷基胺的阳离子具有通式模板四个异金属甲酸盐框架[猫] [镓IIIII(HCOO)6 ] {猫是MA(CH 3 NH 3 +),用于1,DMA [(CH 32 NH 2 + ]表示2,EtA(CH 3 CH 2 NH 3 +)表示3,DEtA [(CH 3 CH 22 NH 2 + ]表示4}已通过X射线衍射,差示扫描量热法和介电研究进行了制备和表征。所有的配合物均具有烟碱样结构,它们具有相同的[GaMn(HCOO)6 ] -阴离子构架,具有二叉体(4 12 ·6 3)(4 9 ·6 6)拓扑结构;只有空腔中的抗衡离子是不同的。配合物4在220 K附近经历可逆的铁弹性相变,并伴随着由有序无序DEtA阳离子的冻结引发的可热切换介电常数跃迁。
更新日期:2017-12-28
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