美国北卡罗来纳大学教堂山分校Wei You报道了手性2D钙钛矿中的烷基-芳基阳离子混合。相关研究成果发表在2021年10月21日出版的国际学术期刊《美国化学会杂志》。

研究人员报道了由手性芳胺和非手性烷基铵间隔阳离子（1:1摩尔比）组成的2D杂化钙钛矿。这些新型钙钛矿具有前所未有的手性和烷基-芳基功能性的结合，以及由其晶体结构决定的非共价分子间相互作用（例如CH··π相互作用）。混合阳离子钙钛矿显示出明显不同于纯手性阳离子类似物的圆二色性，为调整已知手性钙钛矿的手性光学性质提供了新途径，而不是仅仅依赖于其他复杂的化学合成新的可用手性阳离子。

此外，通过与非手性阳离子混合来稀释手性阳离子密度的能力可以提供一种潜在的方法来定制2D杂化钙钛矿中基于自旋的性质，例如Rashba–Dresselhaus自旋分裂和手性诱导的自旋选择性和磁化效应。

附：英文原文

Title: Alkyl–Aryl Cation Mixing in Chiral 2D Perovskites

Author: Liang Yan, Manoj K. Jana, Peter C. Sercel, David B. Mitzi, Wei You

Issue&Volume: October 21, 2021

Abstract: We report 2D hybrid perovskites comprising a blend of chiral arylammonium and achiral alkylammonium spacer cations (1:1 mole ratio). These new perovskites feature an unprecedented combination of chirality and alkyl–aryl functionality alongside noncovalent intermolecular interactions (e.g., CH···π interactions), determined by their crystal structures. The mixed-cation perovskites exhibit a circular dichroism that is markedly different from the purely chiral cation analogues, offering new avenues to tune the chiroptical properties of known chiral perovskites, instead of solely relying on otherwise complex chemical syntheses of new useable chiral cations. Further, the ability to dilute the density of chiral cations by mixing with achiral cations may offer a potential way to tailor the spin-based properties in 2D hybrid perovskites, such as Rashba–Dresselhaus spin splitting and chirality-induced spin selectivity and magnetization effects.

DOI: 10.1021/jacs.1c06841

Source: https://pubs.acs.org/doi/10.1021/jacs.1c06841