C5‐PPB can be generated. The ambient‐pressure α‐phase is stable up to 0.8 GPa, beyond which it undergoes an isostructural transformation to β‐phase, accompanied by a clearly visible elongation of the crystal. This α‐to‐β phase transition requires the sample to be compressed slowly. When quickly compressed, phase α persists to about 1.5 GPa, beyond which its amorphization starts, accompanied by the appearance
压电响应性小分子的靶向合成以及对其机理的深入了解对于智能设备的开发至关重要。这项工作报告了
硼酸两亲1,4-双(戊氧基)-2-5,双(2-
吡啶乙炔基)-苯(C5-PPB)的合成,结构和压敏性。根据压缩率,C5-PPB中有两个不同的阶段可以生成。环境压力α相在高达0.8 GPa的范围内是稳定的,超过此压力,它经历了同构转变为β相,并伴有清晰可见的晶体伸长。这种从α到β的相变要求样品缓慢压缩。当快速压缩时,相α持续到约1.5 GPa,超过此值它就会开始非晶化,并在最大面上出现不规则的凹槽。机械压力还会影响C5-PPB的光学性能,C5-PPB表现出可逆的机械致变色,在发射过程中发生绿色到青色的转换,并且最大值偏移15 nm。还研究了C5-PPB的电导率作为其晶体堆积的直接结果。