Kwon Taeyeon, Koo Jin Young, Choi Hee Cheul
Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
Angew Chem Int Ed Engl. 2020 Sep 14;59(38):16436-16439. doi: 10.1002/anie.202006263. Epub 2020 Jul 16.
Together with high conductivity, high flexibility is an important property required for next generation organic electronic components. Both properties are difficult to achieve together especially when the components are crystalline because of the intrinsic high brittleness of organic molecular crystals. We report an organic radical crystal system that has both high flexibility and high conductivity. The crystal consists of 9,10-bis(phenylethynyl)anthracene radical cation (BPEA ) units, and shows flexibility under pressure with high conductivity in ambient condition exhibiting average conductivity of 2.68 S cm when normal linear shape, as well as 2.43 S cm when bent. The structural analysis reveals that both a short π-π distance (3.290 Å) between BPEA units that are aligned along the crystal length direction, and the presence of PF counter ions induce flexibility and high electrical conductivity.
高柔韧性与高导电性一样，是下一代有机电子元件所需的重要特性。尤其是当元件为晶体时，由于有机分子晶体固有的高脆性，很难同时实现这两种特性。我们报道了一种兼具高柔韧性和高导电性的有机自由基晶体体系。该晶体由9,10-双（苯乙炔基）蒽自由基阳离子（BPEA ）单元组成，在压力下表现出柔韧性，在环境条件下具有高导电性，正常线性形状时平均电导率为2.68 S cm，弯曲时为2.43 S cm。结构分析表明，沿晶体长度方向排列的BPEA单元之间较短的π-π距离（3.290 Å）以及PF 抗衡离子的存在共同促成了柔韧性和高电导率。
