Issue 1, 2019

Proton transfer in hydrogen-bonded degenerate systems of water and ammonia in metal–organic frameworks

Abstract

Porous crystalline metal–organic frameworks (MOFs) or porous coordination polymers (PCPs) are emerging as a new class of proton conductors with numerous investigations. Some of the MOFs exhibit an excellent proton-conducting performance (higher than 10−2 S cm−1) originating from the interesting hydrogen(H)-bonding networks with guest molecules, where the conducting medium plays a crucial role. In the overwhelming majority of MOFs, the conducting medium is H2O because of its degenerate conjugate acid–base system (H3O+ + H2O ⇔ H2O + H3O+ or OH + H2O ⇔ H2O + OH) and the efficient H-bonding ability through two proton donor and two acceptor sites with a tetrahedral geometry. Considering the systematic molecular similarity to water, ammonia (NH3; NH4+ + NH3 ⇔ NH3 + NH4+) is promising as the next proton-conducting medium. In addition, there are few reports on NH3-mediated proton conductivity in MOFs. In this perspective, we provide overviews of the degenerate water (hydronium or hydroxide)- or ammonia (ammonium)-mediated proton conduction system, the design strategies for proton-conductive MOFs, and the conduction mechanisms.

Graphical abstract: Proton transfer in hydrogen-bonded degenerate systems of water and ammonia in metal–organic frameworks

Article information

Article type
Perspective
Submitted
08 10 2018
Accepted
26 11 2018
First published
28 11 2018
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2019,10, 16-33

Proton transfer in hydrogen-bonded degenerate systems of water and ammonia in metal–organic frameworks

D. Lim, M. Sadakiyo and H. Kitagawa, Chem. Sci., 2019, 10, 16 DOI: 10.1039/C8SC04475A

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