A high-spin ground-state donor-acceptor conjugated polymer
A high-spin ground-state donor-acceptor conjugated polymer
复制标题
DOI：
10.1126/sciadv.aav2336
复制
发表时间：
2019-05-01
期刊：
影响因子：
13.6
通讯作者：
Azoulay, J. D.
中科院分区：
文献类型：
--
作者：
London, A. E.;Chen, H.;Azoulay, J. D.
对高自旋有机材料的兴趣是由实现深远的基础科学和开发集成轻元素自旋，磁性和量子功能的技术的机会驱动的。虽然被广泛研究，这些材料的内在不稳定性使合成复杂化，并妨碍了对有机材料系统中与化学键和电子配对的性质相关的基本性质如何在实际应用中表现出来的理解。在这里，我们展示了一个共轭聚合物半导体，基于交替环噻吩和噻二唑喹喔啉单元，这是一个基态三重态在其中性形式。电子顺磁共振和磁化率测量结果与9.30 x 10（-3）kcal mol（-1）的高到低自旋能隙一致。强相关的电子结构、非常窄的带隙、分子内铁磁耦合、高电导率、溶液可加工性和鲁棒的稳定性为曾经被认为超出当前有机半导体范围的各种技术相关应用打开了大门。
Interest in high-spin organic materials is driven by opportunities to enable far-reaching fundamental science and develop technologies that integrate light element spin, magnetic, and quantum functionalities. Although extensively studied, the intrinsic instability of these materials complicates synthesis and precludes an understanding of how fundamental properties associated with the nature of the chemical bond and electron pairing in organic materials systems manifest in practical applications. Here, we demonstrate a conjugated polymer semiconductor, based on alternating cyclopentadithiophene and thiadiazoloquinoxaline units, that is a ground-state triplet in its neutral form. Electron paramagnetic resonance and magnetic susceptibility measurements are consistent with a high-to-low spin energy gap of 9.30 x 10(-3) kcal mol(-1). The strongly correlated electronic structure, very narrow bandgap, intramolecular ferromagnetic coupling, high electrical conductivity, solution processability, and robust stability open access to a broad variety of technologically relevant applications once thought of as beyond the current scope of organic semiconductors.