Abstract
Metal-organic frameworks (MOFs) are promising candidates for proton-conducting applications. Herein, we report the aqueous synthesis of two new phosphonate-based MOFs comprising glyphosate linkers, [Mg(dpmp)]·2H2O (Mg-NU-225) and [Fe(dpmp)]·2H2O (Fe-NU-225), (dpmp = N,N′-diphosphonomethyl-2,5-piperazinedione), and explore their proton conductivities. Single crystal X-ray diffraction measurements revealed that both frameworks display a two-dimensional layered structure with a cyclic ring ligand which forms in situ from the condensation of two glyphosate molecules. Under humid conditions and over a wide temperature range, water molecules are trapped between adjacent layers and facilitate rapid proton conduction. Mg-NU-225 and Fe-NU-225 recorded proton conductivities of 1.5 × 10-5 and 1.7 × 10-5 S cm-1, respectively, along the plane direction and 1.6 × 10-3 and 9.1 × 10-5 S cm-1 perpendicular to the plane direction at 55 °C and 95% relative humidity, as confirmed by two-contact probe impedance methods. The mechanism of proton transport was found to be that of the Grotthuss model from the low activation energy for proton hopping.
Original language | English (US) |
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Pages (from-to) | 1086-1091 |
Number of pages | 6 |
Journal | Inorganic chemistry |
Volume | 60 |
Issue number | 2 |
DOIs | |
State | Published - Jan 18 2021 |
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
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CCDC 2040932: Experimental Crystal Structure Determination
Afrin, U. (Contributor), Mian, M. R. (Contributor), Otake, K. (Contributor), Drout, R. J. (Contributor), Redfern, L. R. (Contributor), Horike, S. (Contributor), Islamoglu, T. (Contributor) & Farha, O. K. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc26hrj0, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc26hrj0&sid=DataCite
Dataset
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CCDC 2040933: Experimental Crystal Structure Determination
Afrin, U. (Contributor), Mian, M. R. (Contributor), Otake, K. (Contributor), Drout, R. J. (Contributor), Redfern, L. R. (Contributor), Horike, S. (Contributor), Islamoglu, T. (Contributor) & Farha, O. K. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc26hrk1, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc26hrk1&sid=DataCite
Dataset