Physicochemical properties of the cation in organic–inorganic perovskite [NH3(CH2)4(NH3)]ZnBr4 crystals investigated using 1H and 13C nuclear magnetic resonance relaxation
作者:Ae Ran Lim
DOI:10.1016/j.jssc.2021.122438
日期:2021.10
(DSC), and thermogravimetric analysis (TGA). The crystal structure was orthorhombic, and the phase-transition temperatures were 354, 434, and 514 K. In addition, the physicochemical properties of the cations in this crystal were investigated using 1H and 13C nuclear magnetic resonance (NMR) relaxation. The structural environments of 1H and 13C as evaluated by chemical shifts in the [NH3(CH2)4(NH3)]
尽管作为有机-无机杂化钙钛矿具有广泛的应用,但迄今为止尚未发表对[NH 3 (CH 2 ) 4 NH 3 ]ZnBr 4晶体的物理性质和结构动力学的详细研究。这项工作使用 X 射线衍射、差示扫描量热法 (DSC) 和热重分析 (TGA) 研究了这些晶体的结构特性。晶体结构为正交晶系,相变温度分别为 354、434 和 514 K。此外,使用1 H 和13C 核磁共振 (NMR) 弛豫。通过 [NH 3 (CH 2 ) 4 (NH 3 )] 阳离子的化学位移评估的1 H 和13 C的结构环境没有随着温度的升高而显着变化。自旋-晶格弛豫时间T 1ρ为1 H,分别为依赖于温度的变化,但第t 1ρ为13位于N-C-C-C-C-N键的中心C几乎与温度无关。我们比较了 [NH 3 (CH 2 ) 3 NH 3 ]ZnBr 4先前报道的晶体和本文制备的[NH 3 (CH 2 ) 4 (NH 3 )]ZnBr