Communication: Infrared spectroscopy of salt-water complexes

Tandy, Jonathan D., Feng, Cheng, Boatwright, Adrian, Sarma, Gautam, Sadoon, Ahmed M., Shirley, Andrew, Rodrigues, Natercia Das Neves, Cunningham, Ethan M., Yang, Shengfu and Ellis, Andrew M. (2016) Communication: Infrared spectroscopy of salt-water complexes. The Journal of Chemical Physics, 144 (12). ISSN 0021-9606

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Abstract / Description

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.

Item Type:	Article
Uncontrolled Keywords:	infrared spectroscopy; salt-water complexes
Subjects:	500 Natural Sciences and Mathematics > 530 Physics 500 Natural Sciences and Mathematics > 540 Chemistry & allied sciences
Department:	School of Human Sciences
Depositing User:	Jonathan Tandy
Date Deposited:	21 Jun 2016 10:29
Last Modified:	22 Jun 2020 14:38
URI:	https://repository.londonmet.ac.uk/id/eprint/1022

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