A new approach to switchable photochromic materials by combining photochromism and piezochromism together in an AIE-active molecule
A new approach to switchable photochromic materials by combining photochromism and piezochromism together in an AIE-active molecule
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一种将光致变色和压致变色结合在 AIE 活性分子中的可切换光致变色材料的新方法
DOI：
10.1039/c7qm00160f
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发表时间：
2017-09-01
影响因子：
7
通讯作者：
Aldred, Matthew P.
中科院分区：
文献类型：
--
作者：
Yu, Tao;Ou, Depei;Aldred, Matthew P.
设计并合成了一种集聚集致发射（AIE）、压电致变色和光致变色于一体的含三苯基乙烯的咔唑衍生物（TrPEBCar）。在晶体状态下，在448 nm处检测到一个强发射带。在压制结晶固体后，发生了[结晶-非晶]形态转变，由此产生的TrPEBCar的非晶态表现出不同的颜色和在470 nm处的红移发射带。TrPEBCar的光致变色行为是通过在晶体状态下利用二苯乙烯型分子内光环作用实现的。此外，我们首次报道了形态依赖的光致变色现象，其中TrPEBCar的光致变色性质仅在晶体状态下观察到，而在非晶态下没有。因此，压制/烟熏和加热/烟熏方法通过改变晶态和非晶态之间的聚集状态来切换光致变色性能。通过结合压电致变色和光致变色特性，可以很容易地通过不同的颜色和发射特性来观察TrPEBCar的开/关状态。分子结构简单的三苯乙烯衍生物为具有开关和指示剂的门控光致变色材料提供了新的途径。
A carbazole containing triphenylethylene derivative (TrPEBCar) has been designed and synthesized, which combines aggregation-induced emission (AIE), piezochromism and photochromism together. In the crystalline state, an intensive emission band at 448 nm was detected. After pressing the crystalline solid, a [crystalline–amorphous] morphological transition takes place, in which the resulting amorphous state of TrPEBCar exhibits a different color and a red-shifted emission band at 470 nm. Photochromic behavior of TrPEBCar is achieved by utilizing a stilbene-type intramolecular photocyclization in the crystalline state. In addition, we report for the first time morphology-dependent photochromism, in which the photochromic properties of TrPEBCar are only observed in the crystalline state but not in the amorphous state. Therefore, the methods of pressing/fuming and heating/fuming act as gates to switch the photochromic properties by changing the aggregation states between the crystalline and amorphous states. By combining the piezochromic properties with the photochromic properties, the ON/OFF states of TrPEBCar can easily be observed by the different colors and emission properties. The triphenylethylene derivative with simple molecular structure provides a new approach for gated photochromic materials with both switch and indicator.