Raman Spectra of Liquid β-Phenylethylamine and Density Functional Theory Calculations

Min, 谢敏 Xie; Yongjun, 胡勇军 Hu; Huaimin, 谷怀民 Gu

doi:10.3788/cjl201138.0215001

Cited by 2 publications

(1 citation statement)

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“…Through DFT calculations and Raman spectroscopy, Gu's group indicates that all six conformers of liquid 𝛽phenylethylamine could coexist at room temperature, among which A1 and A2 are mirror conformations. [37] The S/R-MPEA we used are two different chiral configurations of 𝛽-phenethylamine. Therefore, we believe that due to the simultaneous existence of achiral ligand OAm and chiral ligand S/R-MPEABr in our system, OAm will form a certain steric hindrance, affecting the conformation of S/R-MPEABr ligand, which may ultimately result in the CD polarity changes of assembly.…”

Section: Chiroptical Propertiesmentioning

confidence: 99%

Ligand‐Assisted Self‐Assembly of 3D Perovskite Nanocrystals into Chiral Inorganic Quasi‐2D Perovskites (n = 3) with Ligand‐Ratio‐Dependent Chirality Inversion

Zhao

Shao

et al. 2023

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Chiral inorganic quasi‐2D perovskites are prepared by self‐assembling 3D perovskites in solution for the first time. The quasi‐2D perovskite synthesized is a pure‐phase perovskite with <n> = 3 and is periodically arranged, which is a big breakthrough in quasi‐2D inorganic perovskites. With the individual chiral CsPbBr3 nanocrystals (NCs) assemble into quasi‐2D perovskite, the g‐factor significantly improved (≈5 × 10−3). In addition, the chiroptical activity of quasi‐2D perovskites is explored to be improved with the lateral size increasing. In the first stage of assembly, chiral optical activity is increased due to the lateral size‐dependent optical activity, while the changes in the later stages are attributable to the chiral morphology. Interestingly, chirality inversion is found to be correlated to the number of ligands. It is believed that different conformers of chiral ligands caused by steric hindrance of the original ligand oleylamine result in opposite circular dichroism (CD) polarities. The chirality inversion phenomenon is universal, regardless of the choice of ligands. This work opens up a new path for the synthesis of quasi‐2D perovskites and provides more opportunities for the modulation of chiral optical activity.

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Section: Chiroptical Propertiesmentioning

confidence: 99%