Citation: Ya-Liang Lai, Juan Su, Le-Xiong Wu, Dong Luo, Xue-Zhi Wang, Xian-Chao Zhou, Chuang-Wei Zhou, Xiao-Ping Zhou, Dan Li. Selective separation of pyrene from mixed polycyclic aromatic hydrocarbons by a hexahedral metal-organic cage[J]. Chinese Chemical Letters, ;2024, 35(1): 108326. doi: 10.1016/j.cclet.2023.108326 shu

Selective separation of pyrene from mixed polycyclic aromatic hydrocarbons by a hexahedral metal-organic cage

College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China

zhouxp@jnu.edu.cn

Received Date: 23 December 2022
Revised Date: 10 February 2023
Accepted Date: 8 March 2023
Available Online: 11 March 2023

Figures(7)

Polycyclic aromatic hydrocarbons (PAHs) play an important role in the industry, and the development of new materials for the selective separation of PAHs is of great significance. In this work, we report a hexahedral metal-organic cage with low symmetry by subcomponent self-assembly. In this cage, the eight Zn^Ⅱ centers adopt an interesting ΛΛ/ΔΔΔΔΔΔ or ΛΛΛΛΛΛ/ΔΔ configuration. This cage with a cavity volume of 520 Å³ can bind anthracene, phenanthrene, and pyrene to form 1:1 host-guest complexes, while the bigger triphenylene, chrysene, perylene, and coronene cannot be encapsulated. The binding constant K_a of pyrene is about 1.110 × 10³ (mol/L)⁻¹_, which is more than an order of magnitude larger than that of anthracene and phenanthrene (111 (mol/L)⁻¹, 277 (mol/L)⁻¹, respectively). X-ray structure studies reveal that the pyrene is located in the cavity and stabilized by multiple CH⋅⋅⋅π interactions. After separation from a mixture of PAHs, pyrene with > 96.1% purity can be obtained. This work provides a useful method for the first time for the selective separation of pyrene from PAHs mixture by utilizing a metal-organic cage as the material, making it a useful tool for purifying and separating specific compounds from complex mixtures.
- Polycyclic aromatic hydrocarbons,
- Metal-organic cage,
- Host-guest chemistry,
- Selective separation
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