Sirenko Valerii Y, Kucheriv Olesia I, Fritsky Igor O, Gumienna-Kontecka Elzbieta, Dascălu Ioan-Andrei, Shova Sergiu, Gural'skiy Il'ya A
Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64, 01601 Kyiv, Ukraine.
Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50383 Wrocław, Poland.
Dalton Trans. 2023 Aug 1;52(30):10545-10556. doi: 10.1039/d3dt02056h.
Lead halide hybrid perovskites incorporating chiral organic cations attract considerable attention due to their promising application in multifarious optoelectronic devices. However, the examples of chiral hybrid perovskites are still limited, which greatly impedes their further studies in various optoelectronic fields. Herein, we report on new low-dimensional lead-halide hybrid perovskites incorporating the enantiopure chiral α-amino acid L-proline. Two hybrid perovskites (L-proH)PbBr·HO () and (L-proH)PbBr·4HO () have been synthesized by employing different ratios of organic and inorganic precursors. According to structural analysis, the inorganic sublattice of compound is built of one-dimensional (1D) [PbX] lead halide chains, whereas the inorganic sublattice of compound is built upon a rare two-dimensional (2D) [PbBr] honeycomb-type inorganic framework. Hirshfeld surface analysis revealed an important role of various hydrogen bonding interactions in providing the binding between organic and inorganic parts of these hybrid perovskites. The optical band gap values of new hybrid perovskites as estimated using the Tauc plot approach are 4.19 eV () and 4.13 eV (). Also, new compounds display low-temperature broadband photoluminescence which can be attributed to the self-trapped excitons. These results show the potential of α-proline for constructing novel and highly demanded chiral hybrid perovskites, which will hold great promise for further optoelectronic applications.
包含手性有机阳离子的卤化铅杂化钙钛矿因其在多种光电器件中的应用前景而备受关注。然而，手性杂化钙钛矿的实例仍然有限，这极大地阻碍了它们在各种光电领域的进一步研究。在此，我们报道了一种新型的低维卤化铅杂化钙钛矿，它包含对映体纯的手性α-氨基酸L-脯氨酸。通过采用不同比例的有机和无机前驱体，合成了两种杂化钙钛矿（L-proH）PbBr₃·H₂O（1）和（L-proH）₂PbBr₄·4H₂O（2）。根据结构分析，化合物1的无机亚晶格由一维（1D）[PbX₃]卤化铅链构成，而化合物2的无机亚晶格则基于一种罕见的二维（2D）[PbBr₄]蜂窝型无机框架构建。Hirshfeld表面分析揭示了各种氢键相互作用在提供这些杂化钙钛矿的有机和无机部分之间的结合方面的重要作用。使用Tauc图方法估算的新型杂化钙钛矿的光学带隙值分别为4.19 eV（1）和4.13 eV（2）。此外，新化合物显示出低温宽带光致发光，这可归因于自陷激子。这些结果表明α-脯氨酸在构建新型且需求旺盛的手性杂化钙钛矿方面的潜力，这将为进一步的光电应用带来巨大希望。
