1240557-01-0Relevant articles and documents
The Effect of N-Containing Supports on Catalytic CO Oxidation Activity over Highly Dispersed Pt/UiO-67
Zhuang, Gui-Lin,Bai, Jia-Qi,Zhou, Xiang,Gao, Yi-Fen,Huang, Hong-Liang,Cui, Hai-Quan,Zhong, Xing,Zhong, Chong-Li,Wang, Jian-Guo
, p. 172 - 178 (2017)
Investigations of the effects of the support on catalytic properties are important for heterogeneous systems. Herein, we report the preparation of highly dispersed Pt nanoparticles (NPs) in three isomorphous UiO-67-type metal–organic frameworks (MOFs), namely, pristine UiO-67, N-UiO-67, and NH2-UiO-67. Structural measurements revealed that the sizes of the Pt NPs were 4.5 nm for Pt/UiO-67 and 2.5 nm for N-UiO-67 and NH2-UiO-67. The dominant influences on the sizes of the Pt NPs are the functional groups of the support and the pore size of the MOF. Furthermore, CO catalytic oxidations were performed as a model reaction. Interestingly, the catalytic performance sequence is 5 % Pt/N-UiO-67 > 5 % Pt/UiO-67 > 5 % Pt/NH2-UiO-67. A combination of experimental measurement and DFT calculation revealed that the catalytic properties depend on not only the size of the Pt NPs but also the nature of the support.
Linker Exchange via Migration along the Backbone in Metal-Organic Frameworks
Al Danaf, Nader,Schrimpf, Waldemar,Hirschle, Patrick,Lamb, Don C.,Ji, Zhe,Wuttke, Stefan
, p. 10541 - 10546 (2021)
In metal-organic frameworks (MOFs), organic linkers are subject to postsynthetic exchange (PSE) when new linkers reach sites of PSE by diffusion. Here, we show that during PSE, a bulky organic linker is able to penetrate narrow-window MOF crystals. The bulky linker migrates by continuously replacing the linkers gating the otherwise impassable windows and serially occupying an array of backbone sites, a mechanism we term through-backbone diffusion. A necessary consequence of this process is the accumulation of missing-linker defects along the diffusion trajectories. Using fluorescence intensity and lifetime imaging microscopy, we found a gradient of missing-linker defects from the crystal surface to the interior, consistent with the spatial progression of PSE. Our success in incorporating bulky functional groups via PSE extends the scope of MOFs that can be used to host sizable, sophisticated guest species, including large catalysts or biomolecules, which were previously deemed only incorporable into MOFs of very large windows.
Anthracene-Tagged UiO-67-MOF as Highly Selective Aqueous Sensor for Nanoscale Detection of Arginine Amino Acid
Khavasi, Hamid Reza,Mohammadi, Leila
, p. 13091 - 13097 (2020)
In the present paper, new functionalized UiO-67 metal-organic frameworks (MOF) which contain aromatic tagged groups such as phenyl, naphthyl, and anthracene have been synthesized, characterized, and used for sensing water-soluble amino acids. The results show that anthracene-tagged UiO-67-MOF is shown to act as a highly efficient and selective aqueous sensor for arginine over other water-soluble amino acids in nanoscale. Upon adding an increasing amount of arginine, PL bands of the anth-UiO-67 MOF quenched completely, while there is no perturbation in the PL bands for other amino acid observed. This MOF allows a selective ratiometric detection of arginine without any interference from other amino acids.
Thermolabile groups in metal-organic frameworks: Suppression of network interpenetration, post-synthetic cavity expansion, and protection of reactive functional groups
Deshpande, Rajesh K.,Minnaar, Jozeph L.,Telfer, Shane G.
, p. 4598 - 4602 (2010)
(Figure Presented) Creating nothing out of something: A bulky tert-butoxycarbonyl group on a biphenyl-4,4'-dicarboxylate ligand suppresses interpenetration to give an open, cubic metal-organic framework. Postsynthetic cleavage of this group by simple thermolysis (see picture) unmasks a potentially reactive amino functional group, increases the void space (yellow sphere), and widens the pore apertures.
