Solvation of UCI sub(6) super(2-) Anionic Complex by MeBu sub(3)N+, BuMe sub(2)lm super(+), and BuMelm super(+) Cations

The complexes [MeBu sub(3)N] sub(2)[UCI sub(6)] and [BuMe sub(2)lm] sub(2)[UCI sub(6)] were characterized in the solid state and in solution of [MeBu sub(3)N][Tf sub(2)N], [BuMe sub(2)lm][Tf sub(2)N], and [BuMelm][Tf sub(2)N] room-temperature ionic liquids using single-crystal XRD, EXAFS, electrochemistry, UV-visible absorption spectroscopy, and NMR. In the solid state and in solution, the existence of hydrogen bonding between the UCI sub(6) super(2-) complex and the ionic liquid cations was revealed by these techniques. The MeBu sub(3)N+ cation interacts with UCI sub(6) super(2-) via the protons on the a-carbon atoms of nitrogen. The protons of the imidazolium ring account for the interaction between the BuMe sub(2)lm super(+) cation and the UCI sub(6) super(2-) anion. For the BuMelm super(+) cation the major interaction was confirmed between the most acidic proton on C(2) and the chlorides of UCI sub(6) super(2-). The experimental results also show that the intensity of the interaction between the UCI sub(6) super(2-) anion and the cation varies with the ionic liquid cation in the following order: MeBu sub(3)N+ [approximate] BuMe sub(2)lm super(+)