Fourier Transform Nuclear Magnetic Resonance Studies of 67Zn

Abstract

67Zn nuclear magnetic resonance studies of various solutions of diverse zinc salts in H2O and D2O are reported. In the solutions of ZnI2, ZnBr2 and ZnCl2 a remarkable chemical shift to higher frequency is observable, whilst for Zn(ClO4)2, Zn(NO3)2 and ZnSO4 no shift is detectable. The 67Zn shifts in zinc halide solutions depend on the isotopic composition of the solvent. The substitution of hydrogen by deuterium in the solvent yields for the 67Zn line an anomalous solvent isotope effect to higher frequency. Moreover for increasing temperature a linear increase of the shift and a nonlinear decrease of the linewidth for the zinc halide solutions were observed. The ratio of the Larmor frequencies of 67Zn and 37Cl has been measured in an aqueous zinc perchlorate solution, and a magnetic moment has been calculated for 67Zn. The shielding constant for the hydrated zinc ion has been evaluated: σ*(hydrated 67Zn++ versus 67Zn atom) = − (6.9 ± 0.1) · 10−4.