中国科学院福建物质结构研究所吴明燕团队的一项最新研究研制了在阴离子柱框架中静电电位匹配从三元混合物中提纯六氟乙烷。2025年4月8日，国际知名学术期刊《德国应用化学》发表了这一成果。

本文首次报道了阴离子柱状mof用于氟化电子特种气体的分离，利用SIFSIX-1-Cu双极孔中独特的静电电位匹配，实现了CF₃CH₂F/CF₃CHF₂/CF₃CF₃的基准分离。在0.01 bar时，SIFSIX-1-Cu对CF₃CH₂F和CF₃CHF₂的吸附量最高，对CF3CH2F/CF3CF3和CF3CHF2/CF3CF3的IAST选择性最高。此外，通过CF₃CH₂F/CF₃CHF₂/CF₃CF₃（5/5/90）的一步突破实验，可以获得高纯度（≥99.995%）的CF₃CF₃，产量达到创纪录的882.9 L/kg。理论计算进一步揭示了电负性SiF62-和部分电正性H位点的共存促进了SIFSIX-1-Cu通过多重超分子相互作用有效地锚定CF₃CH₂F和CF₃CHF₂。

据悉，从三元CF₃CH₂F/CF₃CHF₂/CF₃CF₃混合物中一步提纯CF₃CF₃是至关重要的，因为它在半导体工业中具有重要作用。然而，由于难以在多孔材料中创建特定的识别位点，化学惰性CF₃CF₃的有效分离仍然具有挑战性。

附：英文原文

Title: Electrostatic Potential Matching in an Anion-Pillared Framework for Benchmark Hexafluoroethane Purification from Ternary Mixture

Author: Shuixiang Zou, Wenjing Zhang, Cheng Chen, Danhua Song, Hengbo Li, Yashuang Li, Jinghong Yang, Rajamani Krishna, Mingyan Wu

Issue&Volume: 2025-04-08

Abstract: One-step purification of CF3CF3 from ternary CF3CH2F/CF3CHF2/CF3CF3 mixture is crucial since its vital role in the semiconductor industry. However, efficient separation of chemically inert CF3CF3 remains challenging due to the difficulty in creating specific recognition sites in porous materials. In this work, we report the first example of anion-pillared MOFs to the separation of fluorinated electronic specialty gases, utilizing the unique electrostatic potential matching in the bipolar pores of SIFSIX-1-Cu to realize a benchmark CF3CH2F/CF3CHF2/CF3CF3 separation. SIFSIX-1-Cu exhibits the highest CF3CH2F and CF3CHF2 adsorption capacity at 0.01 bar, as well as the highest CF3CH2F/CF3CF3 and CF3CHF2/CF3CF3 IAST selectivity. Additionally, high-purity (≥ 99.995%) CF3CF3 with record productivity (882.9 L/kg) can be acquired through one-step breakthrough experiment of CF3CH2F/CF3CHF2/CF3CF3 (5/5/90). Theoretical calculations further reveal that the coexistence of electronegative SiF62- and partially electropositive H sites promotes SIFSIX-1-Cu to effectively anchor CF3CH2F and CF3CHF2 through multiple supramolecular interactions.

DOI: 10.1002/anie.202505355

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202505355