Solvates of a dianisyl-substituted donor-acceptor-type benzothiadiazole: mechanochromic, vapochromic, and acid-responsive multicolor luminescence
Solvates of a dianisyl-substituted donor-acceptor-type benzothiadiazole: mechanochromic, vapochromic, and acid-responsive multicolor luminescence
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二茴香基取代的供体-受体型苯并噻二唑的溶剂化物：机械致色、蒸汽致色和酸响应多色发光
DOI：
10.1039/d2ce01705a
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发表时间：
2023
期刊：
影响因子：
3.1
通讯作者：
Suguru Ito
中科院分区：
文献类型：
--
作者：
Takumi Yagi;Takashi Tachikawa;Suguru Ito
近年来，有机晶体的机械变色发光(MCL)在机械刺激下能够改变发光颜色的研究取得了很大的进展。尽管一些多晶型晶体和溶剂化合物已经显示出多色的MCL性质，但要从单一的发光化合物中合理地产生多色发射的多晶型晶体和溶剂化合物，还需要进一步深入了解晶体结构和刺激响应性能之间的关系。在此，实现了含二苯甲酰基的菲咯咪唑苯并噻二唑衍生物的溶剂盐的多色发光切换。四种不同发光性质的溶剂盐在机械刺激诱导的非晶化过程中改变了发光颜色。当暴露在溶剂蒸气中时，无定形状态被重新结晶成溶剂。此外，含有吡啶分子的溶剂酸盐在暴露于酸性蒸气时，发射波长发生了红移。典型的酸响应发光开关的特征是发光分子的碱性部分质子化，而在本研究中，发光颜色的变化可以通过质子化溶剂中的非发光吡啶分子来诱导。本研究为智能发光传感器的发展提供了有益的启示。
Recently, great advances have been made in the mechanochromic luminescence (MCL) of organic crystals that can switch their emission colors upon exposure to mechanical stimuli. Although several polymorphic crystals and solvates have exhibited multicolor MCL properties, a further deep understanding of the relationship between crystal structures and stimuli-responsive properties is required for rationally generating multicolor-emissive polymorphic crystals and solvates from a single luminescent compound. Herein, multicolor luminescence switching has been achieved for solvates of a phenanthroimidazolylbenzothiadiazole derivative with dianisyl groups. Four types of solvates with different luminescence properties changed their emission colors upon amorphization induced by mechanical stimuli. The amorphous state was recrystallized into solvates when exposed to solvent vapors. Furthermore, the solvate containing pyridine molecules showed a bathochromic shift in emission wavelength upon exposure to acid vapor. Typical acid-responsive luminescence switching is characterized by the protonation of the basic moiety of luminescent molecules, whereas in this study, the change in luminescence color could be induced by protonating non-luminescent pyridine molecules in the solvate. The present study potentially provides useful insights for the development of smart luminescent sensors.