NMR study of Ni2+ salts dissolved in ionic liquids

Nickel complexes play an important role in preparative and mechanicistic chemistry and catalysis. The structure of Nickel Chloride in ionic Liquids has been studied by X-ray absorption. We investigated molecular interactions between Ni2+ salts and IL based on imidazolium (bmim) and pyrazolium (bmpy) cation (0.9 IL/0.1 Ni2+) . Nuclear Magnetic Resonance homonuclear and heteronuclear NOEs correlation experiments (NOESY and HOESY) techniques were used together with viscosity and conductivity measurements in order to understand the local structure of Ni2+-doped IL. These results are compared with the pure compounds. Moreover, the (1H- 19F)-HOESY experiments give information on cation-anion interactions for these new molecules. Combining all the NMR results, it is possible lo propose a local organization and interaction model for this new sintetized IL doped with Ni2+ salts. The influence of different anions (Cl-, N03- and Tf2N-) for the bmim cation is also discussed.