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Infrared spectroscopy of salt-water complexes

journal contribution
posted on 05.04.2016, 10:13 by Andrew M. Ellis, Jon Tandy, Cheng Feng, Adrian Boatwright, Gautam Sarma, Ahmed M. Sadoon, Andrew Shirley, Natercia Das Neves Rodrigues, Ethan Cunningham, Shengfu Yang
To explore how the ion-pair in a single salt molecule evolves with the addition of water, infrared (IR) spectra of complexes composed of NaCl and multiple water molecules have been recorded for the first time. The NaCl(H2O)n complexes were formed and probed in liquid helium nanodroplets, and IR spectra were recorded for n = 1 → 4. The spectra for n = 1, 2, and 3 are consistent with formation of the lowest energy contact-ion pair structures in which each water molecule forms a single ionic hydrogen bond to an intact Na+Cl− ion-pair. Alternative structures with hydrogen bonding between water molecules become energetically competitive for n = 4, and the IR spectrum indicates likely the coexistence of at least two isomers.

History

Citation

Journal of Chemical Physics, 2016, 144, 121103

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

AM (Accepted Manuscript)

Published in

Journal of Chemical Physics

Publisher

American Institute of Physics

issn

0021-9606

eissn

1089-7690

Acceptance date

22/03/2016

Copyright date

2016

Available date

05/04/2016

Publisher version

http://scitation.aip.org/content/aip/journal/jcp/144/12/10.1063/1.4945342

Language

en

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