Abbas Muhammad, Murari Bhargavasairam, Sheybani Simin, Joy Monu, Balkus Kenneth J
Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Rd, Richardson, TX 75080, USA.
Materials (Basel). 2024 Aug 26;17(17):4213. doi: 10.3390/ma17174213.
Tuning a material's hydrophobicity is desirable in several industrial applications, such as hydrocarbon storage, separation, selective CO capture, oil spill cleanup, and water purification. The introduction of fluorine into rare-earth (RE) metal-organic frameworks (MOFs) can make them hydrophobic. In this work, the linker bis(trifluoromethyl)terephthalic acid (TTA) was used to make highly fluorinated MOFs. The reaction of the TTA and RE (RE: Y, Gd, or Eu) ions resulted in the primitive cubic structure () exhibiting RE dimer nodes (RE-TTA-). The crystal structure of the RE-TTA- was obtained. The use of the 2-fluorobenzoic acid in the synthesis resulted in fluorinated hexaclusters in the face-centered cubic () framework (RE-TTA-), analogous to the UiO-66 MOF. The RE-TTA- has fluorine on the linker as well as in the cluster. The MOFs were characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis, and contact angle measurements.
在若干工业应用中，如碳氢化合物储存、分离、选择性二氧化碳捕集、溢油清理和水净化等，调节材料的疏水性是很有必要的。将氟引入稀土（RE）金属有机框架（MOF）可使其具有疏水性。在这项工作中，连接体双（三氟甲基）对苯二甲酸（TTA）被用于制备高度氟化的MOF。TTA与稀土（稀土元素：钇、钆或铕）离子反应生成具有原始立方结构（）且呈现稀土二聚体节点（RE-TTA-）的产物。获得了RE-TTA-的晶体结构。在合成过程中使用2-氟苯甲酸，在面心立方（）框架（RE-TTA-）中生成了氟化六聚簇，类似于UiO-66 MOF。RE-TTA-在连接体以及簇中均含有氟。通过粉末X射线衍射、X射线光电子能谱、热重分析和接触角测量对这些MOF进行了表征。
