Defect-sensitive crystals based on diaminomaleonitrile-functionalized Schiff base with aggregation-enhanced emission
Defect-sensitive crystals based on diaminomaleonitrile-functionalized Schiff base with aggregation-enhanced emission
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DOI：
10.1039/c3tc31562b
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发表时间：
2013-01-01
影响因子：
6.4
通讯作者：
Tang, Ben Zhong
中科院分区：
文献类型：
--
作者：
Han, Tianyu;Hong, Yuning;Tang, Ben Zhong
在这项工作中，我们报告了一种新型发光体 A3MN（一种二氨基马来腈功能化席夫碱）的合成和光物理研究。 A3MN 具有聚集增强发射 (AEE) 活性：A3MN 的发射随着聚集体的形成而增强。 A3MN 还具有扭曲分子内电荷转移 (TICT) 特性，显示出明显的溶剂化荧光变色现象。有趣的是，A3MN 的晶体是非发射性的；然而，正如光谱方法和共焦显微镜所证实的那样，晶体的缺陷区域具有高发射性。通过利用这种缺陷敏感特征，开发了一种“开启”型机械荧光变色材料，其发射在压力或剪切力下显着增强。由于其“开启”性质，检测极限达到 0.1 牛顿。这种缺陷引起的发射还使得 A3MN 对各种机械动作敏感，包括撞击、摩擦、雕刻和超声波振动。
In this work, we report the synthesis and photophysical studies of a new luminogen, A3MN, a diaminomaleonitrile-functionalized Schiff base. A3MN is aggregation-enhanced emission (AEE)-active: the emission of A3MN is enhanced with the aggregate formation. A3MN also possesses twisted intramolecular charge transfer (TICT) properties, showing noticeable solvatofluorochromism. Interestingly, the crystals of A3MN are nonemissive; the defect areas of the crystal, however, are highly emissive, as confirmed by spectroscopic methods and confocal microscopy. By taking advantage of this defect sensitive feature, a "turn-on" type of mechanofluorochromic material is developed, the emission of which is significantly enhanced under pressure or shear force. The detection limit reaches 0.1 Newton owing to its "turn-on" nature. Such defect-induced emission also renders A3MN sensitive to various kinds of mechanical actions, including hitting, friction, sculpture, and ultrasonic vibration.