¹³C and ²⁷Al NMR Relaxation, Viscosity, and ¹H Diffusion Studies of an Ethylaluminum Dichloride Melt

13 C and 27 Al NMR relaxation studies of a 1:1 1-ethyl-3-methylimidazolium chloride (MEICl)−ethylaluminum dichloride (EtAlCl 2 ) melt provide rotational correlation times for MEI + and EtAlCl 2 which are compared with viscosities and diffusion coefficients. Diffusion coefficients for MEICl and EtAlCl 2 in a 1:1 MEICl−EtAlCl 2 melt are determined simultaneously using 1 H diffusion ordered spectroscopy (DOSY). All MEI + diffusion coefficients (ring, methyl, and ethyl protons) are virtually identical at a given temperature as are the methylene and methyl protons of EtAlCl 2 . The MEI + and EtAlCl 2 diffusion coefficients are viscosity dependent and correlate with 13 C and 27 Al NMR rotational correlation times, indicating that the transport properties of the 1:1 MEICl−EtAlCl 2 melt are determined by the molar quantities of salt and not by the properties of the individual ions. Microviscosity factors provide reasonable values for the radius of MEI + from both viscosity and 13 C NMR rotational correlation times. The “slip” model is used to describe the movement of MEI + in the 1:1 MEICl−EtAlCl 2 melt.