Synthesis, characterization, and phase transition of an inorganic-organic hybrid compound, [(3-nitroanilinium+)(18-crown-6)][IO4−](CH3OH)
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- 作者：Zun-Qi Liu ; zunqi85@163.com ; Yang Liu ; Yuan Chen ; Wu-Qiang Zhao ; Wei-Na Fang
- 关键词：Phase transition ; Crystal structure ; Molecular rotation ; Dielectric anomaly
- 刊名：Chinese Chemical Letters
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：28
- 期：2
- 页码：297-301
- 全文大小：683 K
- 卷排序：28
文摘
A novel inorganic–organic hybrid supramolecular compound, [(3-nitroanilinium+)(18-crown-6)][IO4−](CH3OH) (1), was discovered as phase-transition materials displaying dielectric anomalous behaviors. The yellow block crystal formed by N–H···O hydrogen bonding that made contact through the cavity of 18-crown-6 was characterized by single-crystal X-ray diffraction, elemental analysis, infrared analysis, thermogravimetric analysis, differential scanning calorimetry, and potential-energy calculations. Differential scanning calorimetry measurements indicate that the compound experiences a reversible phase transition at around 220 K. Temperature-dependent dielectric measurements further confirm the phase transitions. Potential-energy calculations demonstrate that the phase transition occurs due to the molecular order–disorder rotation of CH3OH, whereas the space grouping of the crystal remains unchanged.