Piezochromic luminescence of amide and ester derivatives of tetraphenylpyrene—role of amide hydrogen bonds in sensitive piezochromic response
作者:Mitsutaka Sase、Shingo Yamaguchi、Yoshimitsu Sagara、Isao Yoshikawa、Toshiki Mutai、Koji Araki
DOI:10.1039/c0jm03950k
日期:——
A series of amide and ester derivatives of 1,3,6,8-tetraphenylpyrene (TPPy) were prepared, and their solid-state luminescence, molecular packing, and piezochromic responses were studied in order to improve and refine the design concept of piezochromic luminescent materials based on the use of multiple hydrogen bonds and close packing of disk-shaped aromatic cores as competing factors in the control of molecular packing. The amide derivative of TPPy having hexyl side chains (1b) showed a sensitive luminescence response at a relatively low applied pressure, which was ascribed to the hydrogen bond-directed H-type columnar packing. Application of higher pressure induced considerable destruction of the hydrogen bond-directed structure, leading to the state where close packing was the overriding factor directing the molecular assembly and showed similar piezochromic response to that of the ester derivative. Based on the results, the role of the amide hydrogen bonds and the side chains was discussed in detail.
制备了一系列 1,3,6,8-四苯基吡喃(TPPy)的酰胺和酯衍生物,并研究了它们的固态发光、分子填料和压变色响应,以改进和完善基于多氢键和盘状芳香核紧密填料作为分子填料控制竞争因素的压变色发光材料的设计理念。具有己基侧链的 TPPy 酰胺衍生物(1b)在相对较低的外加压力下显示出灵敏的发光响应,这归因于氢键导向的 H 型柱状堆积。施加较高的压力会导致氢键定向结构遭到严重破坏,从而导致紧密堆积成为指导分子组装的首要因素,并显示出与酯衍生物类似的压电变色响应。基于这些结果,我们详细讨论了酰胺氢键和侧链的作用。