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Tuning the Surface Chemistry of Metal Organic Framework Nodes: Proton Topology of the Metal-Oxide-Like Zr6 Nodes of UiO-66 and NU-1000

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.6b08273· OSTI ID:1388680
 [1];  [2];  [3];  [4];  [3];  [2];  [2];  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Univ. of Minnesota, Minneapolis, MN (United States)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Northwestern Univ., Evanston, IL (United States); King Abdul-Aziz Univ., Jeddah (Saudi Arabia)
Some metal organic frameworks (MOFs) incorporate nodes that are nanoscale metal oxides, and the hydroxycontaining functional groups on them provide opportunities for introducing catalytic sites with precisely defined structures. Investigations have been done to understand the structures of these groups on nodes and node vacancies, because, in prospect, atomic-scale modulation of the composition, areal density, and/or siting of the groups would open up possibilities for exquisite tuning of the siting and performance of subsequently anchored catalytic units (e.g., single metal ions, pairs of metal ions, or well-defined metal-ion-containing clusters). In this work we have combined infrared (IR) spectroscopy and density functional theory (DFT) to demonstrate tuning of these sites, namely, hydrogen-bonded OH/OH2 groups on the Zr6 nodes of the MOFs UiO-66 and NU-1000 via the intermediacy of node methoxy (or ethoxy) groups formed from methanol (or ethanol). Methoxy (or ethoxy) groups on node vacancy sites are converted to a structure incorporating one vacant Zr site and one terminal OH group per face by reaction with water. Our results highlight how the combination of DFT and IR spectroscopy facilitates the determination of the identity and chemistry of the functional groups on MOF node vacancies and defect sites.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Inorganometallic Catalyst Design (ICDC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012702
OSTI ID:
1388680
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 46 Vol. 138; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Operando study of palladium nanoparticles inside UiO-67 MOF for catalytic hydrogenation of hydrocarbons journal January 2018
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Elucidating the mechanism of the UiO-66-catalyzed sulfide oxidation: activity and selectivity enhancements through changes in the node coordination environment and solvent journal January 2019
Single-site metal–organic framework catalysts for the oxidative coupling of arenes via C–H/C–H activation journal January 2019
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Discovery of precise pH-controlled biomimetic catalysts: defective zirconium metal–organic frameworks as alkaline phosphatase mimics journal January 2019
Band gap modulation in zirconium-based metal–organic frameworks by defect engineering journal January 2019
Accelerated proton transmission in metal–organic frameworks for the efficient reduction of CO 2 in aqueous solutions journal January 2019
Substitution-type luminescent MOF sensor with built-in capturer for selective cholesterol detection in blood serum journal January 2019
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Band Gap Modulation in Zirconium-Based Metal-Organic Frameworks by Defect Engineering journal July 2019
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Figures / Tables (7)