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A Preinstalled Protic Cation as a Switch for Superprotonic Conduction in a Metal-Organic Framework.


ABSTRACT: Metal-organic frameworks (MOFs), made from various metal nodes and organic linkers, provide diverse research platforms for proton conduction. Here, we report on the superprotonic conduction of a Pt dimer based MOF, [Pt2(MPC)4Cl2Co(DMA)(HDMA)·guest] (H2MPC, 6-mercaptopyridine-3-carboxylic acid; DMA, dimethylamine). In this framework, a protic dimethylammonium cation (HDMA+) is trapped inside a pore through hydrogen bonding with an MPC ligand. Proton conductivity and X-ray measurements revealed that trapped HDMA+ works as a preinstalled switch, where HDMA+ changes its relative position and forms an effective proton-conducting pathway upon hydration, resulting in more than 105 times higher proton conductivity in comparison to that of the dehydrated form. Moreover, the anisotropy of single-crystal proton conductivity reveals the proton-conducting direction within the crystal. The present results offer insights into functional materials having a strong coupling of molecular dynamic motion and transport properties.

SUBMITTER: Otsubo K 

PROVIDER: S-EPMC8790730 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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A Preinstalled Protic Cation as a Switch for Superprotonic Conduction in a Metal-Organic Framework.

Otsubo Kazuya K   Nagayama Shuya S   Kawaguchi Shogo S   Sugimoto Kunihisa K   Kitagawa Hiroshi H  

JACS Au 20220103 1


Metal-organic frameworks (MOFs), made from various metal nodes and organic linkers, provide diverse research platforms for proton conduction. Here, we report on the superprotonic conduction of a Pt dimer based MOF, [Pt<sub>2</sub>(MPC)<sub>4</sub>Cl<sub>2</sub>Co(DMA)(HDMA)·guest] (H<sub>2</sub>MPC, 6-mercaptopyridine-3-carboxylic acid; DMA, dimethylamine). In this framework, a protic dimethylammonium cation (HDMA<sup>+</sup>) is trapped inside a pore through hydrogen bonding with an MPC ligand.  ...[more]

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