【摘 要】
:
Two phase transition materials[iPrQ]2MnBr4(1,iPrQ = N-isopropyl-quinuclidinium)and[iPrQ]2MnCl4(2)were synthesized and characterized.Dielectric measurements and
【机 构】
:
School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenji
论文部分内容阅读
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.
其他文献
A process of air gap membrane distillation (AGMD) supplemented by vacuum pump was built as shown in figure to improve the AGMD performance.The performance o
近年来,我陆续看过不少关于百岁寿星的报道,发现了这样一个规律:几乎所有的长寿老人,性格中都带有与世无争、乐观开朗等特点,可以说,老寿星都属于性格健康的人。那么,什么样
在健身也要赶潮流的今天,人们已经不能满足于简单、基础的普拉提运动,于是健身中心开始对这一运动进行改良。提取普拉提运动的核心,辅之以新的训练技巧以加入时尚的元素,让健
研究了改进碳酸钠法选择性脱钙与聚四氟乙烯中空纤维多效膜蒸馏过程相结合用于海水淡化厂外排浓水深度浓缩的可行性.浓海水中钙离子的脱除率可达91%以上,可有效防止高倍数浓缩
以武钢权证的行权价与其正股价相比,认购权证价值近似于零,认沽权证也不过几毛钱。那么支撑目前它们高昂价格的基础和奥妙何在呢?
WISCO warrants the exercise price compa
随着停止住房实物分配,实行住房分配货币化政策的不断深入,住房已成为人们的消费热点。然而,在我们对购房职工的调查中发现,有些准备购房的职工缺乏对政策的了解,表现出盲目性,就是
【摘 要】在城市化进程不断加快的时代,城市绿地景观在一定程度上反映出一个城市的品味。绿地景观作为城市的重要组成部分,有其区别于建筑物等硬質景观的主要特点是前者随着时间的推移,其景观效果日益显现,而后者随着时间的推移,其景观效果往往日益衰退。绿地景观的主要组成部分是活的园林植物,其可塑性强,这种特点决定了绿地景观的日常养护非常重要。如何做好城市绿地的日常养护需要我们去不断探索和总结,在此发表一些浅见
全球变暖已是公认的事实,成为国际社会普遍关注的焦点问题之一.水安全是国家安全的重要支撑,在全球变暖背景下,我国面临着一定程度的水危机.本文详细分析了全球变暖给我国水
本文提出要完成我区今年交通基本建设计划必须抓好的几项工作。
This article proposes several tasks that must be done to complete the transportation infrastructure
1病例报告患者,男,83岁。自述十余年前无明显诱因出现双侧鼻塞,呈持续性,时有黄脓涕及头部闷胀感,上述症状渐进性加重,逐渐出现闭塞性鼻音,夜间睡眠张口呼吸,偶有憋醒,嗅觉丧