The subtle importance of collective motions on isotropic Magnetic and non-magnetic ionic liquid systems

Abstract:
In recently published works aiming to study the paramagnetic properties of magnetic ionic liquids using 1H NMR relaxometry and diffusometry, X-ray diffractometry revealed, for some of the studied systems, a well-defined local structure motivated by the segregation of the polar and non-polar domains [1]. Although these compounds did not present the same degree of order as a liquid crystal, it was only possible to consistently combine the data from all experimental techniques considering order parameter fluctuations as a possible relaxation pathway.

The present work combines 1H NMR relaxometry and diffusometry with X-ray scattering experiments in the study of the molecular dynamics of magnetic and non-magnetic ionic liquids based on the [P6,6,6,14]+ and [C8mim]+ cations. The data from all experimental techniques corroborated the need to consider either order parameter fluctuations or layer undulations in the model fitting analysis of these ionic systems, despite their apparent isotropic nature.