Temperature-Dependent Mechanochromic Behavior of Mechanoresponsive Luminescent Compounds
Temperature-Dependent Mechanochromic Behavior of Mechanoresponsive Luminescent Compounds
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DOI：
10.1021/acs.chemmater.6b04720
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发表时间：
2017-02-14
影响因子：
8.6
通讯作者：
Weder, Christoph
中科院分区：
文献类型：
--
作者：
Sagara, Yoshimitsu;Kubo, Kazuya;Weder, Christoph
机械响应发光（MRL）化合物在机械处理时改变其发射颜色。已经研究了数百种MRL化合物，但它们在高温下的机械触发反应实际上尚未探索。在这里，我们证明了温度可以有一个显着的影响，机械诱导的反应MRL化合物。一种新的氰基取代的低聚（对亚苯基亚乙烯基）衍生物的光致发光显示出显着的红移时，地面在环境温度下，而在100摄氏度相同的处理导致一个hypochromic位移。在环境中的行为是由机械诱导的相变从结晶到无定形固体中的染料分子形成准分子，而在升高的温度下的hyposochromic移位归因于晶体-结晶相变。这种依赖于温度的MRL行为以前没有观察到，但它似乎是一个通用的效果，是有用的复杂的机械传感材料和设备。
Mechanoresponsive luminescent (MRL) compounds change their emission color upon mechanical treatment. Hundreds of MRL compounds have been studied, but their mechanically triggered response at elevated temperature has remained virtually unexplored. Here, we demonstrate that the temperature can have a significant influence on the mechanically induced response of MRL compounds. The photoluminescence of a new cyano-substituted oligo(p-phenylenevinylene) derivative was shown to exhibit a significant red-shift when ground at ambient temperature, whereas the same treatment at 100 degrees C leads to a hypsochromic shift. The behavior at ambient is caused by a mechanically induced phase transition from a crystalline to an amorphous solid in which the dye molecules form excimers, whereas at elevated temperature the hypsochromic shift is ascribed to a crystalline-crystalline phase transition. Such temperature-dependent MRL behavior was not previously observed, but it appears to be a general effect that is useful for sophisticated mechano-sensing materials and devices.