Affiliation:
1. Department of Chemistry and Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology (SUSTech) Shenzhen 518055 China
Abstract
Abstract0D hybrid metal halides (0D HMHs) with fully isolated inorganic units provide an ideal platform for studying the correlations between chiroptical activities and crystal structures at atomic levels. Here, through the incorporation of different solvent molecules, a series of 0D chiral manganese bromides (RR/SS‐C20H28N2)3MnBr8·2X (X = C2H5OH, CH3OH, or H2O) are synthesized to elucidate their chiroptical properties. They show negligible circular dichroism signals of Mn absorptions due to C2v‐symmetric [MnBr4]2− tetrahedra. However, they display distinct circularly polarized luminescence (CPL) signals with continuously increased luminescence asymmetry factors (glum) from 10−4 (X = C2H5OH) to 10−3 (X = H2O). The increased glum value is structurally revealed to originate from the enhancement of [MnBr4]2‐ tetrahedral bond‐angle distortions, due to the presence of different solvent molecules. Furthermore, (RR/SS‐C20H28N2)MnBr4·H2O enantiomers with larger bond‐angle distortions of [MnBr4]2− tetrahedra are synthesized based on hydrobromic acid‐induced structural transformation of (RR/SS‐C20H28N2)3MnBr8·2H2O enantiomers. Therefore, such (RR/SS‐C20H28N2)MnBr4·H2O enantiomers exhibit enhanced CPL signals with |glum| up to 1.23 × 10−2. This work provides unique insight into enhancing chiroptical activities in 0D HMH systems.
Funder
National Natural Science Foundation of China
Shenzhen Science and Technology Innovation Program
Guangdong Provincial Department of Science and Technology
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献