Two-step mechanoresponsive luminescence and mechanical stimuli-induced release of small molecules exhibited by a luminescent cyclophane,Journal of Materials Chemistry C

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Two-step mechanoresponsive luminescence and mechanical stimuli-induced release of small molecules exhibited by a luminescent cyclophane
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-12-28 , DOI: 10.1039/d0tc04853d
Yoshimitsu Sagara _{1,

2,

3,

4,

5} , Kiyonori Takahashi _{4,

6,

7,

8} , Atsushi Seki _{4,

9,

10,

11,

12} , Tatsuya Muramatsu _{1,

2,

3,

4} , Takayoshi Nakamura _{4,

6,

7,

8} , Nobuyuki Tamaoki _{4,

6,

7,

8}

Affiliation

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.

中文翻译：

机械发光的两步发光和机械激发诱导的小分子的发光环磷烯释放

从单个分子实现多种机械响应的发光相关功能仍然具有挑战性。在这里，我们证明了基于9,10-双（苯基乙炔基）蒽的环烷可以实现两步机械响应发光和小客体分子的释放。当轻轻压碎时，由于表面分子堆积的变化，环烷的黄色发射晶体表现出发射带的色变。随后的研磨由于伴随着从结晶态到非晶态过渡的受激准分子的形成而导致发射带的红移。环烷的另一个假多晶型物响应机械刺激，从其晶体结构中释放出氯仿，伴随着从黄绿色到黄色的光致发光颜色变化。这些结果表明，发光环烷是产生复杂的机械响应发光材料的有前途的候选者。

更新日期：2021-01-08

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