Triphenylamine functionalized beta-Ketoiminate boron complex exhibiting aggregation-induced emission and mechanofluorochromism
Triphenylamine functionalized beta-Ketoiminate boron complex exhibiting aggregation-induced emission and mechanofluorochromism
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三苯胺功能化 β-酮亚胺硼络合物表现出聚集诱导发射和机械荧光变色
DOI：
10.1016/j.dyepig.2016.10.019
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发表时间：
2017
影响因子：
4.5
通讯作者：
Yang Yan
中科院分区：
文献类型：
--
作者：
Zhou Lin;Xu Defang;Gao Huaizhi;Han Aixia;Liu Xingliang;Zhang Chao;Li Zheng;Yang Yan
设计并成功合成了一种新的三苯胺功能化β-酮亚胺酸硼配合物bf2 - tpa，其电子给体为三苯胺，电子受体为β-亚胺烯醇酸硼。理论计算和光谱分析证实了D -π-A型共轭化合物具有明显的分子内电荷转移特性。该化合物具有明显的AIE特性，在固体状态下具有较高的荧光量子产率。bf2 - tpa2在THF中的荧光作用非常弱，而在水/THF （fw= 70%）混合物中观察到显著的AIE效应，AIE因子高达188。有趣的是，bf2 - tpapo具有独特的机械荧光（MFC）行为。制备的bf2 - tpac2粉末在紫外照射下可发出以549 nm为中心的强黄光，研磨后荧光颜色变为橙色（590 nm），红移41 nm。这种机械变色在用CH2Cl2进行研磨和气熏处理后是可逆的。粉末XRD研究表明，MFC是在外力作用下由结晶-非晶态相变产生的。详细研究了其结构与性能之间的关系。所得结果对理解MFC机理和设计新型MFC材料具有重要的指导意义。
A new triphenylamine functionalized β-Ketoiminate boron complexBF2-TPAthat bears the electron donor triphenylamine and the electron acceptor β-iminoenolate boron moiety, has been designed and successfully synthesized. The D–π–A type conjugated compound showed obvious intramolecular charge transfer (ICT) properties, which were evidenced by theoretical calculations and spectral analysis. The compound exhibited evident AIE characteristic with high fluorescence quantum yield in the solid state.BF2-TPAwas quite weakly fluorescent in THF, while a significant AIE effect was observed in water/THF (fw= 70%) mixtures with a large AIE factor of 188. Interestingly,BF2-TPApossesses the distinct mechanofluorochromic (MFC) behavior. The as-prepared powder ofBF2-TPAcould emit strong yellow light centered at 549 nm under UV irradiation, and the fluorescence color changed into orange (590 nm) after grinding, a red shift of 41 nm was observed. Such mechanochromism was reversible upon the treatment of grinding and fuming with CH2Cl2. The powder XRD studies showed that the MFC nature is generated through crystalline–amorphous phase transformation under the stimulus of external force. The relationship between the structure and the properties was studied in detail. The results obtained would be of great help in understanding the MFC mechanism and designing new MFC materials.