Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 207, Issue -, Pages 53-60Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2014.12.033
Keywords
Metal-organic frameworks; Surface mounted metal-organic frameworks; Thin films; Defect; Density-functional theory
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1362]
- Chinese Scholarship Council (CSC) [2011695014]
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The metal organic framework (MOF) UHM-3, constructed with Cu(II)-paddle wheel-type nodes and a new tetracarboxylic acid linker, 5,5'-(dimethylsilanediyl)diisophthalate, has a close-packed alignment of open Cu(II) sites which are of interest for applications in gas storage and separation. Here, we first report on the growth of oriented, homogeneous and virtually defect-free (below 1%) UHM-3 MOF thin films on a solid substrate using a room-temperature liquid phase epitaxy (LPE) method. Thermal postsynthetic treatment allowed to induce Cu(I) defect sites in a controlled fashion. The interaction of CO and CO2 with the Cu(II) and Cu(I) sites was then studied using X-ray photoelectron spectroscopy (XPS) and IR-spectroscopy. The binding energy of these two species was determined using temperature-induced desorption. The interaction between the guest molecules and the Cu(I) and Cu(II) sites were also analyzed using density-functional theory (DFT). Surprisingly, both experiment and theory show that the binding energy of CO2 to Cu(I) and Cu(II) sites are essentially identical, in pronounced contrast to CO, which binds much stronger to Cu(I). (C) 2015 Elsevier Inc. All rights reserved.
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