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63 Cu nuclear magnetic resonance (NMR) and viscosity studies of 0:064M CuClO 4  solutions have been reported in binary mixtures of acetonitrile (AN) with pyridine (Py) and 2, 3, and 4-picolines (2,3,4-Pic) at 298 K using a Bruker 500 MHz NMR spectrometer and an Ubbelohde viscometer, respectively. Chemical shift d and linewidth D for the  63 Cu signals have been recorded referenced to a 0:064M CuClO 4  solution in anhydrous AN. The copper quadrupole coupling constants ( e  2  Qq = h ) have been calculated in all cases. The variation of the d and  e  2  Qq = h  values as a function of mol fraction of the co-solvent show that all these bases interact with Cu +  more strongly than AN. They replace AN from the Cu +  complexed with AN in the form [Cu(AN) 4 ] +  and form a mixed complex of the type [Cu(AN) 4 -x(S)x] +  ( x =1 - 4) where S stands for the base. At relatively high mole fraction of the co-solvents, the mixed solvated complex gradually changes to a more symmetrical complex of the type [Cu(S) 4 ] +  which remains stable in the solution. The solvating effect of 2-Pic and 4-Pic is observed to be stronger than that of Py and 3-Pic.

A Comparative Nuclear Magnetic Resonance Study of the Solvation of CuClO 4 in Binary Mixtures of Acetonitrile with Pyridine and Picolines at 298K