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Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53
Dynamics of water and other small molecules confined in nanoporous materials is one of the current topics in condensed matter physics. One popular host material is a benzenedicarboxylate-bridging metal (III) complex abbreviated to MIL-53, whose chemical formula is M(OH)[C(6)H(2)(CO(2))(2)R(2)] where...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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American Crystallographic Association
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8514252/ https://www.ncbi.nlm.nih.gov/pubmed/34660845 http://dx.doi.org/10.1063/4.0000122 |
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author | Miyatsu, Satoshi Kofu, Maiko Shigematsu, Akihito Yamada, Teppei Kitagawa, Hiroshi Lohstroh, Wiebke Simeoni, Giovanna Tyagi, Madhusudan Yamamuro, Osamu |
author_facet | Miyatsu, Satoshi Kofu, Maiko Shigematsu, Akihito Yamada, Teppei Kitagawa, Hiroshi Lohstroh, Wiebke Simeoni, Giovanna Tyagi, Madhusudan Yamamuro, Osamu |
author_sort | Miyatsu, Satoshi |
collection | PubMed |
description | Dynamics of water and other small molecules confined in nanoporous materials is one of the current topics in condensed matter physics. One popular host material is a benzenedicarboxylate-bridging metal (III) complex abbreviated to MIL-53, whose chemical formula is M(OH)[C(6)H(2)(CO(2))(2)R(2)] where M = Cr, Al, Fe and R = H, OH, NH(2), COOH. These materials absorb not only water but also ammonia molecules. We have measured the quasi-elastic neutron scattering of MIL-53(Fe)-(COOH)(2)·2H(2)O and MIL-53(Fe)-(COOH)(2)·3NH(3) which have full guest occupancy and exhibit the highest proton conductivity in the MIL-53 family. In a wide relaxation time region (τ = 10(−12)–10(−8) s), two relaxations with Arrhenius temperature dependence were found in each sample. It is of interest that their activation energies are smaller than those of bulk H(2)O and NH(3) liquids. The momentum transfer dependence of the relaxation time and the temperature dependence of the relaxation intensity suggest that the proton conduction is due to the Grotthuss mechanism with thermally excited H(2)O and NH(3) molecules. |
format | Online Article Text |
id | pubmed-8514252 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Crystallographic Association |
record_format | MEDLINE/PubMed |
spelling | pubmed-85142522021-10-15 Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 Miyatsu, Satoshi Kofu, Maiko Shigematsu, Akihito Yamada, Teppei Kitagawa, Hiroshi Lohstroh, Wiebke Simeoni, Giovanna Tyagi, Madhusudan Yamamuro, Osamu Struct Dyn Articles Dynamics of water and other small molecules confined in nanoporous materials is one of the current topics in condensed matter physics. One popular host material is a benzenedicarboxylate-bridging metal (III) complex abbreviated to MIL-53, whose chemical formula is M(OH)[C(6)H(2)(CO(2))(2)R(2)] where M = Cr, Al, Fe and R = H, OH, NH(2), COOH. These materials absorb not only water but also ammonia molecules. We have measured the quasi-elastic neutron scattering of MIL-53(Fe)-(COOH)(2)·2H(2)O and MIL-53(Fe)-(COOH)(2)·3NH(3) which have full guest occupancy and exhibit the highest proton conductivity in the MIL-53 family. In a wide relaxation time region (τ = 10(−12)–10(−8) s), two relaxations with Arrhenius temperature dependence were found in each sample. It is of interest that their activation energies are smaller than those of bulk H(2)O and NH(3) liquids. The momentum transfer dependence of the relaxation time and the temperature dependence of the relaxation intensity suggest that the proton conduction is due to the Grotthuss mechanism with thermally excited H(2)O and NH(3) molecules. American Crystallographic Association 2021-10-12 /pmc/articles/PMC8514252/ /pubmed/34660845 http://dx.doi.org/10.1063/4.0000122 Text en © 2021 Author(s). https://creativecommons.org/licenses/by/4.0/All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ). |
spellingShingle | Articles Miyatsu, Satoshi Kofu, Maiko Shigematsu, Akihito Yamada, Teppei Kitagawa, Hiroshi Lohstroh, Wiebke Simeoni, Giovanna Tyagi, Madhusudan Yamamuro, Osamu Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 |
title | Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 |
title_full | Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 |
title_fullStr | Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 |
title_full_unstemmed | Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 |
title_short | Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53 |
title_sort | quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in mil-53 |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8514252/ https://www.ncbi.nlm.nih.gov/pubmed/34660845 http://dx.doi.org/10.1063/4.0000122 |
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