One of the noticeable observation is that for the complexes with a second solvation shell, the 𝐵𝐵𝐵𝐵 𝑀𝑀𝑀𝑀𝑀𝑀 + difference between the Nd(III) and Yb(III) complexes is not as pronounced as the 𝐵𝐵𝐵𝐵 𝑃𝑃𝑃𝑃 6 - in the first solvation shell only results. From this observation, we can assume that the first solvation shell, i.e., the binding of PF6 -, triggers the complexation more than the [MMI] + binding. As the binding of PF6 -is stronger for Yb(III) than Nd(III), we can say that the studied RTIL has a preference for heavy REs, i.e., for Yb(III).