Introduction of functional groups that can form intermolecular hydrogen bonds into highly-emissive luminophores is a promising way to induce mechanochromic luminescence. Herein, we report that a 9,10-bis(phenylethynyl)anthracene derivative featuring two amide groups forms green-emissive crystals based on two-dimensional hydrogen-bonded molecular sheets. Mechanical grinding changed the emission from green to yellow, owing to a transition from a crystalline to an amorphous phase. Infrared spectroscopy revealed that mechanical stimuli disrupted the linear hydrogen-bonding formation. A thermal treatment recovered the original green photoluminescence.

中文翻译：

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由分子间氢键合片构成的晶体的机械变色发光。

将可以形成分子间氢键的官能团引入高度发射性的发光体中是诱导机械致变色发光的一种有前途的方法。在此，我们报道了具有两个酰胺基的9,10-双（苯基乙炔基）蒽衍生物形成了基于二维氢键分子片的绿色发射晶体。由于从晶相到非晶相的过渡，机械研磨将发射光从绿色变为黄色。红外光谱显示，机械刺激破坏了线性氢键的形成。热处理恢复了原始的绿色光致发光。