吡嗪连接的二维多孔共轭有机骨架的制备及其顺磁特性

Preparation of two-dimensional pyrazine-linked conjugated organic skeletons and their paramagnetic properties

本文通过自下而上的溶液合成方法成功制备了具有良好结晶性的吡嗪连接的二维共轭骨架HATP–HKH固体粉末.通过X射线粉末衍射、傅里叶变换红外光谱、高分辨透射电镜、原子力显微镜、超导量子干涉仪磁强计测试、电子自旋共振光谱等手段对材料进行了表征.液相剥离法制备的HATP–HKH纳米片的厚度分布在0.8至1.4 nm之间,且其具有和量子反点石墨烯相似的结构特征.在2 K下,HATP–HKH表现出明显的居里顺磁特性,饱和磁化强度达到0.029 emu g^(-1).同时,我们观测到HATP–HKH的自由基信号.研究结果表明,HATP–HKH的顺磁特性不是金属离子的残留引起的,而是它本身所固有的,其多孔结构、锯齿形边、氮杂原子掺杂和自由基有利于产生磁性.该材料有望被开发并应用于电子学及自旋电子学器件.

A two-dimensional pyrazine-linked conjugated organic framework with good crystallinity, namely HATP–HKH powder, was successfully prepared by a bottom-up synthesis approach. The structure and magnetic property of the material were characterized by powder X-ray diffraction patterns, Fourier-transform infrared spectra, high-resolution transmission microscopy, atomic force microscopy, superconducting quantum interferometer device magnetometer,electron spin resonance spectroscopy, and other instruments. The HATP–HKH nanosheets prepared by the liquid-phase exfoliation showed a height in the range of 0.8-1.4 nm. The structure of the nanosheets was analogous to that of graphene-antidot lattices. At 2 K, the material exhibited a typical paramagnetic behavior with the magnetization of 0.029 emu g^(-1). Such a material could be developed and applied in the electronics and spintronic devices.