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The opposite effects of sodium and potassium cations on water dynamics
Water rotational dynamics in NaSCN and KSCN solutions at a series of concentrations are investigated using femtosecond infrared spectroscopy and theory. Femtosecond infrared measurements, consistent with previous NMR observations, detect that sodium slows down while potassium accelerates the water O...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Royal Society of Chemistry
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5390786/ https://www.ncbi.nlm.nih.gov/pubmed/28451283 http://dx.doi.org/10.1039/c6sc03320b |
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author | Zhang, Qiang Chen, Hailong Wu, Tianmin Jin, Tan Pan, Zhijun Zheng, Junrong Gao, Yiqin Zhuang, Wei |
author_facet | Zhang, Qiang Chen, Hailong Wu, Tianmin Jin, Tan Pan, Zhijun Zheng, Junrong Gao, Yiqin Zhuang, Wei |
author_sort | Zhang, Qiang |
collection | PubMed |
description | Water rotational dynamics in NaSCN and KSCN solutions at a series of concentrations are investigated using femtosecond infrared spectroscopy and theory. Femtosecond infrared measurements, consistent with previous NMR observations, detect that sodium slows down while potassium accelerates the water O–H bond rotation. Results of reported neutron scattering measurements, on the other hand, suggested that these two cations have similar structure-breaking effects on water, and therefore should both accelerate water rotation through the presumably dominating large-amplitude angular jump component. To explain this discrepancy, theoretical studies with both classical and ab initio models were carried out, which indicate that both ions indeed accelerate the large-amplitude angular jump rotation of the water molecules, while the observed cation specific effect originates from the non-negligible opposite impact of the sodium and potassium cations on the diffusive rotation of water molecules. |
format | Online Article Text |
id | pubmed-5390786 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-53907862017-04-27 The opposite effects of sodium and potassium cations on water dynamics Zhang, Qiang Chen, Hailong Wu, Tianmin Jin, Tan Pan, Zhijun Zheng, Junrong Gao, Yiqin Zhuang, Wei Chem Sci Chemistry Water rotational dynamics in NaSCN and KSCN solutions at a series of concentrations are investigated using femtosecond infrared spectroscopy and theory. Femtosecond infrared measurements, consistent with previous NMR observations, detect that sodium slows down while potassium accelerates the water O–H bond rotation. Results of reported neutron scattering measurements, on the other hand, suggested that these two cations have similar structure-breaking effects on water, and therefore should both accelerate water rotation through the presumably dominating large-amplitude angular jump component. To explain this discrepancy, theoretical studies with both classical and ab initio models were carried out, which indicate that both ions indeed accelerate the large-amplitude angular jump rotation of the water molecules, while the observed cation specific effect originates from the non-negligible opposite impact of the sodium and potassium cations on the diffusive rotation of water molecules. Royal Society of Chemistry 2017-02-01 2016-10-14 /pmc/articles/PMC5390786/ /pubmed/28451283 http://dx.doi.org/10.1039/c6sc03320b Text en This journal is © The Royal Society of Chemistry 2016 http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 Unported License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Chemistry Zhang, Qiang Chen, Hailong Wu, Tianmin Jin, Tan Pan, Zhijun Zheng, Junrong Gao, Yiqin Zhuang, Wei The opposite effects of sodium and potassium cations on water dynamics |
title | The opposite effects of sodium and potassium cations on water dynamics
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title_full | The opposite effects of sodium and potassium cations on water dynamics
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title_fullStr | The opposite effects of sodium and potassium cations on water dynamics
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title_full_unstemmed | The opposite effects of sodium and potassium cations on water dynamics
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title_short | The opposite effects of sodium and potassium cations on water dynamics
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title_sort | opposite effects of sodium and potassium cations on water dynamics |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5390786/ https://www.ncbi.nlm.nih.gov/pubmed/28451283 http://dx.doi.org/10.1039/c6sc03320b |
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