TY - JOUR

T1 - How Like-Charge Attraction Influences the Mobility of Cations in Hydroxyl-Functionalized Ionic Liquids

AU - Khudozhitkov, Alexander E

AU - Paschek, Dietmar

AU - Stepanov, Alexander G

AU - Kolokolov, Daniil I

AU - Ludwig, Ralf

N1 - This work has been supported by the Russian Science Foundation (grant No. 21-13-00047). R.L. is grateful to the Deutsche Forschungsgemeinschaft (DFG) for financing the projects LU 506/15-1 (grant No. 401427621) and LU 506/14-2 (grant No. 286149019). D.I.K. thanks the Humboldt Foundation (AvH) for awarding a Humboldt Research Fellowship for Experienced Researchers. A.G.S. acknowledges financial support by the Ministry of Science and Higher Education of the Russian Federation (budget Project no. AAAA-A21-121011390053-4 for Boreskov Institute of Catalysis).

PY - 2023/5/4

Y1 - 2023/5/4

N2 - Attractive interactions between ions of like charge remain an elusive concept. Observing and quantifying this type of interaction in liquids and solutions is still a major challenge. Recently, we have shown that cation-cation interactions are present in hydroxyl-functionalized ionic liquids and that they can be controlled by the shape, charge distribution and functionality of the ions. In the present study, we demonstrate that cationic cluster formation does not only change the local structures of the ionic liquids but also influences the dynamics of the cations in a characteristic way. We show that solid-state 2H NMR spectroscopy is well suited for the study of molecular motion, even if the hydrogen bonded species of interest are indistinguishable due to fast deuteron exchange. We also provide valuable information about the applicability of well-accepted relaxation models.

AB - Attractive interactions between ions of like charge remain an elusive concept. Observing and quantifying this type of interaction in liquids and solutions is still a major challenge. Recently, we have shown that cation-cation interactions are present in hydroxyl-functionalized ionic liquids and that they can be controlled by the shape, charge distribution and functionality of the ions. In the present study, we demonstrate that cationic cluster formation does not only change the local structures of the ionic liquids but also influences the dynamics of the cations in a characteristic way. We show that solid-state 2H NMR spectroscopy is well suited for the study of molecular motion, even if the hydrogen bonded species of interest are indistinguishable due to fast deuteron exchange. We also provide valuable information about the applicability of well-accepted relaxation models.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85156199106&origin=inward&txGid=a1983c109f8e69b91d381c116d8c7b20

U2 - 10.1021/acs.jpclett.3c00463

DO - 10.1021/acs.jpclett.3c00463

M3 - Article

C2 - 37093004

VL - 14

SP - 4019

EP - 4025

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 17

ER -