Li Zhen, Yan Yan, Song Mu-Sen, Xin Jia-Yu, Wang Hai-Yu, Wang Hai, Wang Yu
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.
J Phys Chem Lett. 2022 May 12;13(18):4073-4081. doi: 10.1021/acs.jpclett.2c00698. Epub 2022 May 2.
The interaction between organic cations and inorganic metal halide octahedral units strongly affects the properties of organic-inorganic hybrid metal halides. The "soft" property of the lattice provides the possibility of its strong exciton-phonon interaction. Here we report one-dimensional (1D) lead-free chiral organic-inorganic hybrid metal halide single crystals of (/)-methylbenzylamine bismuth iodide (/-MBA)BiI, which exhibits a high level of octahedral bond distortion. The introduction of chiral amines leads to a strong chiroptical response in the range of 200-600 nm. The strong exciton-phonon coupling can be observed through the coherent oscillation spectrum of transient absorption dynamics at room temperature. The coherent phonon oscillation frequencies are ∼97 and ∼130 cm, corresponding to the symmetrical stretching or bending of the Bi-I octahedron. Our work provides new insights for the study of exciton-phonon coupling in 1D chiral hybrid metal halides.
有机阳离子与无机金属卤化物八面体单元之间的相互作用强烈影响有机-无机杂化金属卤化物的性质。晶格的“软”性质为其强激子-声子相互作用提供了可能性。在此，我们报道了一维（1D）无铅手性有机-无机杂化金属卤化物单晶（/）-甲基苄胺铋碘化物（/-MBA）BiI，其表现出高水平的八面体键畸变。手性胺的引入导致在200-600nm范围内产生强烈的圆二色响应。通过室温下瞬态吸收动力学的相干振荡光谱可以观察到强激子-声子耦合。相干声子振荡频率约为97和130cm，对应于Bi-I八面体的对称拉伸或弯曲。我们的工作为研究一维手性杂化金属卤化物中的激子-声子耦合提供了新的见解。
