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

Abstract

⁶³CU 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 (δ), linewidth (Δ) and relative intensity (I) of the ⁶³CU NMR signal have been measured relative to 0.064 <i>M </i>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-methoxypropionitrile and ethyl benzene 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.