Ji Qin, Li Linhai, Deng Siyu, Cao Xingxing, Chen Lizhuang
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, P. R. China.
Dalton Trans. 2018 Apr 24;47(16):5630-5638. doi: 10.1039/c8dt00623g.
Two phase transition materials (H2dabco-C2H5)[ZnCl4] and (H2dabco-C2H5)[CoCl4] were synthesized and characterized. Differential scanning calorimetry detected that the two compounds underwent reversible phase transitions at 245 K and 261 K, respectively. The temperature dependence of the dielectric measurements also confirmed the phase transition. Variable-temperature single-crystal X-ray diffraction suggested that the two compounds underwent the same phase transitions from the space group Pnma to P21/c but at different temperatures. Symmetry breaking occurred with an Aizu notation of mmmF2/m. The structural phase transitions of 1 and 2 were ascribed to the distortion of a [H2dabco-C2H5]2+ cation from inorganic-organic hybrid materials (H2dabco-C2H5)[MIICl4] (M = Zn, Co). The strong variations of dielectric anomaly made compounds 1 and 2 applicable for use in promising switchable dielectric materials.
合成并表征了两种相变材料(H2dabco-C2H5)[ZnCl4]和(H2dabco-C2H5)[CoCl4]。差示扫描量热法检测到这两种化合物分别在245 K和261 K发生可逆相变。介电测量的温度依赖性也证实了相变。变温单晶X射线衍射表明这两种化合物经历了相同的从空间群Pnma到P21/c的相变，但温度不同。对称破缺发生，其爱津符号为mmmF2/m。1和2的结构相变归因于无机-有机杂化材料(H2dabco-C2H5)[MIICl4](M = Zn, Co)中[H2dabco-C2H5]2+阳离子的畸变。介电异常的强烈变化使化合物1和2适用于有前景的可切换介电材料。
