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首页> 外文期刊>Crystal growth & design >Hidden Transformations of a Crystalline Sponge: Elucidating the Stability of a Highly Porous Three-Dimensional Metal-Organic Framework
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Hidden Transformations of a Crystalline Sponge: Elucidating the Stability of a Highly Porous Three-Dimensional Metal-Organic Framework

机译：结晶海绵的隐藏转变：阐明高度多孔的三维金属-有机骨架的稳定性

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摘要

We present our investigations on the stability of a cobalt thiocyanate-based metal organic framework (MOF), coordinated by the 2,4,6-tris(4-pyridyl)-1,3,5-triazine (TPT) ligand, which is commonly employed for single-crystal-to single-crystal guest inclusion. The selected crystalline solid, {[(Co(NCS)(2))(3)(TPT)(4)]center dot x(solvent)}(n), is one emerging MOF currently being utilized as a host for the crystalline sponge method. Our experimental results shed light on two critical structural transformations that should be considered when attempting the revolutionary crystalline sponge method. We demonstrate that when the crystalline sponge is removed from the solution, a remarkable color change from orange to green is observed, yielding a semiamorphous material. Diffuse reflectance and X-ray absorption spectroscopy studies were carried out on this resulting green compound in order to examine the nature of this transformation. Notably, our analyses indicate a change in the coordination environment of the Co-II metal centers from octahedral to tetrahedral at the surface of the material. We further report a second structural transformation of the crystalline sponge, which arises from an increase in the local concentration of Co(NCS)(2) and leads to a significant change in the composition and structure of the material, giving a two-dimensional planar sheet network.
机译：我们目前对由2,4,6-三（4-吡啶基）-1,3,5-三嗪（TPT）配体协调的基于硫氰酸钴的金属有机骨架（MOF）的研究通常用于单晶到单晶客体内含物。所选的结晶固体{[（Co（NCS）（2））（3）（TPT）（4）]中心点x（溶剂）}（n）是一种新兴的MOF，目前正用作该晶体的主体海绵法。我们的实验结果阐明了尝试进行革命性的结晶海绵法时应考虑的两个关键结构转变。我们证明，当从溶液中除去结晶海绵时，观察到从橙色到绿色的显着颜色变化，产生半非晶材料。对所得的绿色化合物进行了漫反射和X射线吸收光谱研究，以检查这种转变的性质。值得注意的是，我们的分析表明，材料表面Co-II金属中心的配位环境从八面体变为四面体。我们进一步报告了结晶海绵的第二个结构转变，这是由于Co（NCS）（2）局部浓度的增加而引起的，并导致材料的成分和结构发生重大变化，从而产生二维平面工作表网络。

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