Mechanofluorochromic properties of aggregation-induced emission-active tetraphenylethene-containing cruciform luminophores

Mechanofluorochromic properties of aggregation-induced emission-active tetraphenylethene-containing cruciform luminophores
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聚集诱导发射活性四苯乙烯十字形发光体的机械荧光变色特性

DOI:
10.1016/j.dyepig.2018.04.021
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发表时间:
2018-09
期刊:
影响因子:
4.5
通讯作者:
Ling Zang
Ling Zang
中科院分区:
材料科学2区
文献类型:
--
作者:
Yonghui Wang;Defang Xu;Huaizhi Gao;Ying Wang;Xingliang Liu;Aixia Han;ChaoZhang;Ling Zang

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制备了两种扭曲的供体-受体十字形发光体(DHCS-TPE和DMCS-TPE),它们由通过中心苯核连接的两个π共轭链段组成。这种十字形材料表现出独特的分子内电荷转移(ICT)发射、明显的聚集诱导发射(AIE)特性(αAIE分别为19和20)和高固态效率(分别为0.913和0.424)。特别是,这两种化合物表现出依赖于取代基的机械荧光变色(MFC)行为。所制备的更扭曲的DMCS-TPE粉末可以发出以474nm为中心的强蓝绿光,研磨后荧光颜色变为黄绿色(531nm),观察到57nm的红移。这种机械变色现象在用 DCM 研磨和熏制处理后是可逆的。 DMCS-TPE 的高对比度 MFC 行为源于分子构象的平坦化以及随后在外力作用下的平面分子内电荷转移(PICT)。与此形成鲜明对比的是,扭曲程度较小的 DHCS-TPE 没有表现出 MFC 行为。原因是DHCS-TPE较少扭曲的分子构象产生强大的分子间作用力和紧密堆积。因此与DMCS-TPE相比,DHCS-TPE结晶固体粉末具有更高的晶格能和更好的结构稳定性。 DHCS-TPE结晶固体粉末的研磨不会导致非晶化和机械致色发光。
Two twisted donor–acceptor cruciform luminophores (DHCS-TPEandDMCS-TPE) that were composed of two π-conjugated segments connected via a central benzene core have been prepared. Such cruciforms showed unique intramolecular charge transfer (ICT) emission, obvious aggregation-induced emission (AIE) properties (αAIE= 19 and 20, respectively) and high solid state efficiency (0.913 and 0.424, respectively). Especially, the two compounds exhibited substituent-dependent mechanofluorochromic (MFC) behavior. The as-prepared powders of the more twistedDMCS-TPEcould emit strong blue-green light centered at 474 nm, and the fluorescence color changed into yellowish green (531 nm) after grinding, a red shift of 57 nm was observed. Such mechanochromism was reversible upon the treatment of grinding and fuming with DCM. The high contrast MFC behavior ofDMCS-TPEoriginated from the planarization of the molecular conformation and subsequent planar intramolecular charge transfer (PICT) under external force. By sharp contrast, the less twistedDHCS-TPEexhibited no MFC behavior. The reason is that the less twisted molecular conformation ofDHCS-TPEgenerates strong intermolecular forces and close packing. Thus compared toDMCS-TPE, the crystalline solid powders ofDHCS-TPEpossess higher lattice energy and better structural stability. The grinding of the crystalline solid powders ofDHCS-TPEcannot lead to amorphization and mechanochromic luminescence.
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