63Cu nuclear magnetic resonance, density and viscosity studies of copper(I) perchlorate in binary mixtures with acetonitrile

Cu-63 nuclear magnetic resonance, density and viscosity studies of copper(I) perchlorate solutions have been made at 298 K in binary mixtures of acetonitrile with D2O, 4-picoline, 3-methoxypropionitrile and ethylbenzene at several compositions of the mixtures. The chemical shift (delta), linewidth (Delta) and relative intensity (I) of the Cu-63 NMR signal have been measured relative to 0.064 M CuClO4 solution in pure anhydrous acetonitrile. The quadrupole relaxation rate, reorientational correlation time and quadrupole coupling constant have been evaluated in all cases. The variation of quadrupole coupling constant with solvent composition shows that 4-picoline and D2O have a strong effect and 3-methoxyprepionitrile and ethylbenzene have a relatively weak effect on the solvation behaviour of Cu+. Cu+ displays preferential solvation by 4-picoline in acetonitrile + 4-picoline mixtures while it shows preferential solvation by acetonitrile in all other cases.