高对称性的金属有机框架的多核集群
Jingjing Jiang1, Zhiyong Lu2, Mingxing Zhang1
1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , China.
Journal of the American Chemical Society
|September 19, 2018
概括
研究人员开发了一种具有增强对称性的新型金属有机框架 (MOF),用于优质的二氧化碳 (CO2) 捕获. 这种MOF具有很高的二氧化碳吸附性和选择性,因此对气体净化有很大希望.
科学领域:
- 材料科学
- 化学学
- 纳米技术
背景情况:
- 金属有机框架 (MOF) 是具有可调节结构的多孔材料.
- 控制MOF对称性对于优化气体吸附性能至关重要.
- 在不改变底层拓的情况下,异构转换提供了修改MOF结构的途径.
研究的目的:
- 通过对称性升级的等变换来调整MOF中的多核集群的新方法.
- 合成具有较高对称性的bcu型MOF (NJU-Bai35).
- 评估合成的MOF的二氧化碳捕获和选择性性能.
主要方法:
- 异构转换以提升MOF对称性
- 一种新型bcu型MOF的合成, {[Cu4(μ4-O) Cl2(IN) [4][CuCl2]}∞ (NJU-Bai35).
- 气体吸附和突破性实验以评估二氧化碳的捕获和选择性.
主要成果:
- 成功合成NJU-Bai35,具有较高对称度的集群 [Cu4(μ4-O) Cl2(COO) 4N4].
- 对称性升级调整了MOF通道,增强了CO2分子的合适性.
- NJU-Bai35具有很高的二氧化碳吸附能力 (在0.15巴,298K下为7.20%的重量).
- 对N2 (275.8) 和CH4 (11.6) 的高选择性被观察到.
结论:
- 对称性提升的同型变换是MOF设计的有效策略.
- NJU-Bai35显示了大量的二氧化碳捕获和天然气净化潜力.
- 增强的MOF结构有助于有效地将二氧化碳与其他气体分离.
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