Issue 21, 2019

Hydration and ion association of aqueous choline chloride and chlorocholine chloride

Abstract

The choline ion (Ch+) is ubiquitous in nature and also its synthetic homologue, chlorocholine (ClCh+), is widely used. Nevertheless, surprisingly little information on the hydration and counter-ion binding of these cations can be found in the literature. In this contribution we report effective hydration numbers, determined by dielectric relaxation spectroscopy, and ion-pair association constants with Cl, determined by dilute-solution conductivity measurements. In combination with RISM calculations the obtained data suggest that for Ch+ water is bound to the hydroxy group via hydrogen bonds whereas for ClCh+ a rather stiff clathrate-like shell around the chlorine atom seems to be formed. With Cl both cations form contact ion pairs with association constants of only ∼2 to 3 M−1.

Graphical abstract: Hydration and ion association of aqueous choline chloride and chlorocholine chloride

Supplementary files

Article information

Article type
Paper
Submitted
20 Feb 2019
Accepted
13 May 2019
First published
13 May 2019

Phys. Chem. Chem. Phys., 2019,21, 10970-10980

Hydration and ion association of aqueous choline chloride and chlorocholine chloride

S. Shaukat, M. V. Fedotova, S. E. Kruchinin, M. Bešter-Rogač, Č. Podlipnik and R. Buchner, Phys. Chem. Chem. Phys., 2019, 21, 10970 DOI: 10.1039/C9CP01016E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements