A Preinstalled Protic Cation as a Switch for Superprotonic Conduction in a Metal-Organic Framework
Kazuya Otsubo1, Shuya Nagayama1, Shogo Kawaguchi2
1Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
JACS Au
|January 31, 2022
Summary
This study introduces a platinum-dimer metal-organic framework (MOF) exhibiting superprotonic conduction. Hydration activates trapped dimethylammonium cations, increasing proton conductivity over 100,000-fold.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) are versatile platforms for proton conduction research.
- Developing efficient proton conductors is crucial for energy applications.
Purpose of the Study:
- To investigate the superprotonic conduction mechanism in a novel Pt dimer-based MOF.
- To explore the role of guest molecules in modulating proton transport.
Main Methods:
- Synthesis and characterization of the Pt dimer MOF, [Pt2(MPC)4Cl2Co(DMA)(HDMA)·guest].
- Proton conductivity measurements under varying hydration conditions.
- X-ray diffraction studies to elucidate structural changes.
Main Results:
- The MOF exhibits a significant increase (over 10^5 times) in proton conductivity upon hydration.
- Trapped dimethylammonium cations (HDMA+) act as proton-conducting switches activated by water.
- Anisotropy in single-crystal proton conductivity was observed, indicating directional proton transport.
Conclusions:
- The Pt dimer MOF demonstrates tunable superprotonic conduction.
- The findings highlight the potential of guest molecule dynamics in designing advanced proton conductors.
- This research offers insights into coupling molecular motion with transport properties in functional materials.
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