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Structural Transformation and Spatial Defect Formation of a Co(II) MOF Triggered by Varied Metal-Center Coordination Configuration.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-06-11 , DOI: 10.1021/acs.inorgchem.0c00845
Xiao-Qing Meng 1, 2 , Xiao-Ting Liu 1, 2 , Na Li 1, 2 , Jia Zhao 1, 2 , Ze Chang 1, 2 , Jin-Yu Zheng 3 , Xian-He Bu 1, 2, 4
Affiliation  

In spite of the attractive potential application of the dynamic behavior and defect of metal–organic framework (MOF), the achievement of these features is a challenging goal in the MOF research field. Herein, we report a Co(II) MOF, namely, [Co3(L)2(4-PTZ)2(H2O)2]n·solvent (H2L = 5-(isonicotinamido)isophthalic acid, 4-PTZ = 5-(4-pyridyl)-1H-tetrazole), that features dynamic structural transformation behaviors. By varying the coordination configuration of metal center through the removal of coordinated water molecules, the porous compound could undergo structural transformation to give a new crystalline phase with larger pore dimension. Moreover, the new phase features a mesoporous structure originating from the spatial defect that formed with the transformation process, which indicates that the modulation of dynamic behavior of the MOF could be a potential method for the engineering of a spatial defect. In addition, the gas sorption investigation results reveal that the new phase has enhanced selectivity for CO2/N2, CO2/CH4, and C2H2/C2H4 systems compared with that of the pristine phase, suggesting the potential of spatial defect engineering for the tuning of MOF gas sorption properties.

中文翻译:

Co(II)MOF的结构转变和空间缺陷的形成是由多种金属中心配位构型触发的。

尽管金属-有机骨架(MOF)的动态行为和缺陷具有潜在的吸引力应用,但实现这些功能仍是MOF研究领域中具有挑战性的目标。在此,我们报道了Co(II)MOF,即[Co 3(L)2(4-PTZ)2(H 2 O)2 ] n ·溶剂(H 2 L = 5-(异烟酰胺基)间苯二甲酸4 -PTZ = 5-(4-吡啶基)-1 H-四唑),具有动态的结构转变行为。通过去除配位的水分子来改变金属中心的配位构型,多孔化合物可以进行结构转变,以产生具有较大孔径的新晶相。此外,新相的特征在于介孔结构,该介孔结构源于通过转换过程形成的空间缺陷,这表明MOF的动态行为的调制可能是工程化空间缺陷的潜在方法。此外,气体吸附研究结果表明,新相具有更高的CO 2 / N 2,CO 2 / CH 4和C 2 H选择性。2 / C 2 H 4系统与原始相相比,表明空间缺陷工程对MOF气体吸附性能的调节潜力。
更新日期:2020-07-06
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