Two Low-temperature Phase Transition Compounds Based on Quinuclidine Derivatives with Fluorescence

• 来源期刊: 结构化学
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: theoretical chemistry
• 页码范围: 149-159
• 页数: 11页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2011-2874

摘要

Two phase transition materials[iPrQ]2MnBr4(1,iPrQ = N-isopropyl-quinuclidinium)and[iPrQ]2MnCl4(2)were synthesized and characterized.Dielectric measurements and differential scanning calorimetry showed that the two compounds underwent reversible phase transitions at ca.-47 and-37 ℃,respectively.Variable-temperature single-crystal X-ray diffraction suggested that the two compounds underwent the same phase transitions from space group C2/c to Cc but at different temperature.The variable crystal structures indicated that the structural phase transitions of the compound were ascribed to the torsional movement of quinuclidine ring and the disappearance of the c-slide plane.The second harmonic generation(SHG)response further proved this structural phase transition.Fluorescence tests showed that the two compounds have strong fluorescence.The strong variations in dielectric anomalies make compounds 1 and 2 suitable for promising switchable dielectric materials.