Remarkable Turn-On and Color-Tuned Piezochromic Luminescence: Mechanically Switching Intramolecular Charge Transfer in Molecular Crystals
Remarkable Turn-On and Color-Tuned Piezochromic Luminescence: Mechanically Switching Intramolecular Charge Transfer in Molecular Crystals
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显着的开启和颜色调节压致变色发光：机械切换分子晶体中的分子内电荷转移
DOI：
10.1002/adfm.201501224
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发表时间：
2015-07-08
影响因子：
19
通讯作者：
Tian, Wenjing
中科院分区：
文献类型：
--
作者：
Qi, Qingkai;Qian, Jingyu;Tian, Wenjing
吖啶酮基四苯乙烯（AD-TPE）分子晶体在机械研磨和流体静力学压缩下表现出有趣的开启和颜色调谐发光。在深入的实验和计算研究的基础上，我们推测，从D-相到B-相的压色行为的起源是分子内几何构象的变化，特别是TPE和AD部分之间的扭转角。在两个不同的固相中的不同的分子构象导致分子内电荷转移（ICT）过程的实质性切换，这可以直接与随后的荧光从局部激发（LE）状态和ICT状态在两个阶段。AD-TPE分子系统呈现了在机械刺激下由固态中的激发态的切换驱动的高对比度可逆荧光调谐的非常罕见的实例，并且因此提供了压致变色行为的新机制。
The molecular crystals of acridonyl-tetraphenylethene (AD-TPE) exhibit an intriguing turn-on and color-tuned luminescence in response to mechanical grinding and hydrostatic compression. On the basis of in-depth experimental and computational studies, it is hypothesized that the origin of the piezochromic behavior from the D-phase to the B-phase is the change of the intramolecular geometrical conformation, especially for the torsion angle between the TPE and AD moiety. The different molecular conformation in the two distinctive solid phases causes the substantial switching of the intramolecular charge transfer (ICT) process, which can be directly correlated with the subsequent fluorescence from locally excited (LE) state and ICT state in both phases. The AD-TPE molecular system presents a very rare example of high-contrast reversible fluorescence tuning driven by a switching of the excited state in the solid state under the mechanical stimuli, and thus provides a novel mechanism of the piezochromic behavior.