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使用三维链接器选择性分离六异构体的工程金属有机框架

Courtney S Smoljan¹, Zhao Li¹, Haomiao Xie²

¹Department of Chemical & Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society

|March 10, 2023

概括

研究人员开发了一种精确控制毛孔的金属有机框架 (MOF). 这种MOF有效地分离了六异构体,展示了其高级分子分离的潜力.

科学领域:

材料科学
化学工程
纳米技术

背景情况:

金属有机框架 (MOF) 为吸附和膜分离提供可调节的多孔性.
精确的孔径控制对于分离具有亚安格斯特罗姆尺寸差异的分子至关重要.
现有的MOF通常缺乏精细调节分离所需的孔隙刚性.

研究的目的:

使用3D链接器在MOF中展示精确的孔径控制.
综合和描述一个新的MOF,NU-2002,以提高分离能力.
评估NU-2002在分离六同位素中的性能.

主要方法:

使用双环[1.1.1]-1,3-二酸链接剂合成NU-2002的单晶和散粉.
可变温度的X射线衍射研究分析结构性质和"呼吸"行为.
单元吸附同热测量以评估分离功效.

主要成果:

由于其3D链接器,NU-2002与MIL-53具有相同结构,具有有限的结构呼吸.
吸附等温证实了NU-2002能够分离六同位素.
精确的孔大小是区分六异构体的关键.

结论:

在MOF中安装3D链接器可提供精确的孔径控制,超越1D通道的限制.
对于精选分子分离,特别是对于六异构体,NU-2002是一个有前途的新材料.
这种方法促进了MOF的设计,使其适用于具有挑战性的分离应用.

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