Two-step mechanoresponsive luminescence and mechanical stimuli-induced release of small molecules exhibited by a luminescent cyclophane
Two-step mechanoresponsive luminescence and mechanical stimuli-induced release of small molecules exhibited by a luminescent cyclophane
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DOI：
10.1039/d0tc04853d
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发表时间：
2021-02
影响因子：
6.4
通讯作者：
Yoshimitsu Sagara;Kiyonori Takahashi;A. Seki;Tatsuya Muramatsu;Takayoshi Nakamura;N. Tamaoki
中科院分区：
文献类型：
--
作者：
Yoshimitsu Sagara;Kiyonori Takahashi;A. Seki;Tatsuya Muramatsu;Takayoshi Nakamura;N. Tamaoki
从单个分子中实现多个机械响应发光相关功能仍然具有挑战性。在这里，我们证明了两步机械响应发光和小客体分子的释放都是由9,10-二（苯乙基）蒽基环烷实现的。当轻轻压碎时，环烷的黄色发射晶体表现出发射带的次色移，这是由于表面分子堆积的改变。随后的研磨导致发射带的色移，这是由于伴随晶态到非晶态转变的准分子形成。环烷的另一种伪多晶表现为在机械刺激下从晶体结构释放氯仿，并伴有从黄绿色到黄色的光致发光颜色变化。这些结果表明，发光环烷是制造复杂机械响应发光材料的有希望的候选者。
Achieving multiple mechanoresponsive luminescence-related functions from a single molecule remains challenging. Here, we demonstrate that both two-step mechanoresponsive luminescence and the release of small guest molecules are achieved by a 9,10-bis(phenylethynyl)anthracene-based cyclophane. When gently crushed, the yellow-emissive crystal of the cyclophane exhibits a hypsochromic shift of the emission band, because of alterations in molecular packing at the surface. Subsequent grinding results in a bathochromic shift of the emission band due to excimer formation accompanying the transition from the crystalline state to an amorphous state. Another pseudopolymorph of the cyclophane exhibits the release of chloroform from its crystal structure in response to mechanical stimuli, accompanied by a photoluminescent color change from yellow-green to yellow. These results reveal that luminescent cyclophanes are promising candidates for creating sophisticated mechanoresponsive luminescent materials.