Influence of the Electric Charge of Spin Probes on Their Diffusion in Room-Temperature Ionic Liquids

The rotational and translational diffusion of negatively charged uncharged spin probes in five imidazolium-based room-temperature ionic liquids (RTILs), 1-ethyl-3-methylimidazolium tetrafluoroborate, emimBF4, 1-butyl-3-methylimidazolium bmimBF4, 1-octyl-3-methylimidazolium omimBF4, hexafluorophosphate, omimPF6, chloride, omimCl, has been studied by means electron paramagnetic resonance spectroscopy. Detailed analyses the spin-Hamiltonian parameters exchange interactions have carried out. temperature dependences line broadening induced electronic dipole-dipole interaction coupling are determined. mobility is semiquantitatively characterized successfully explained framework a hypothesis based on assumption polar unpolar domains within RTILs.