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Response of strongly fluorescent carbazole-based benzoxazole derivatives to external force and acidic vapors

机译：强荧光咔唑基苯并恶唑衍生物对外力和酸性蒸气的响应

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摘要

A carbazole-based D-pi-A benzoxazole derivative was found to self-assemble into long fibers, and its emission increased because of the presence of J-aggregates. These fibers exhibited a distinctive response to volatile acid vapors. The vapor of strong acids such as hydrochloric acid or trifluoroacetic acid destroyed the molecular packing within the fiber and produced a fluorescent color change. However, the fibers did not react to the vapor of weak acids such as acetic acid (HOAc). In addition, the fibrous film exhibited isothermally reversible piezo-fluorochromism. Its blue fluorescence was converted to blue-green under a mechanical force and was spontaneously restored at room temperature. More importantly, the response of the fibrous film to HOAc vapor could be controlled by a mechanical stimulus. The colorless ground film readily absorbed HOAc vapor and emitted an orange fluorescence. Furthermore, such colored films were not self-healing, but returned to colorless upon heating, with a blue emission. Acetic acid vapor, may thus, selectively act as a stabilizer and developer to retain the information imparted by a mechanical force. These results show that the response of organic nanofibers to stimuli may be adjusted and controlled by a mechanical stimulus, and vice versa.
机译：发现基于咔唑的D-pi-A苯并恶唑衍生物可自组装成长纤维，并且由于J聚集体的存在，其发射增加。这些纤维对挥发性酸蒸汽表现出独特的响应。强酸（例如盐酸或三氟乙酸）蒸气破坏了纤维内的分子堆积，并产生了荧光色变化。但是，纤维不会与弱酸（例如乙酸（HOAc））的蒸气发生反应。另外，纤维膜表现出等温可逆的压电-荧光致变色。它的蓝色荧光在机械力作用下转变为蓝绿色，并在室温下自发恢复。更重要的是，可以通过机械刺激来控制纤维膜对HOAc蒸气的响应。无色底膜易于吸收HOAc蒸气并发出橙色荧光。此外，这样的有色膜不能自我修复，而是在加热后恢复为无色并发出蓝色。因此，乙酸蒸气可以选择性地充当稳定剂和显影剂，以保留由机械力赋予的信息。这些结果表明，有机纳米纤维对刺激的反应可以通过机械刺激来调节和控制，反之亦然。

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