Abstract
The nuclear magnetic relaxation dispersions (NMRD) of the oxovanadium(IV) ion in water and water-glycerol solutions were studied at different temperatures and viscosities. A contact contribution to T 1M −1 in water was detected at low magnetic fields. At higher magnetic fields, the Solomon dipolar contribution holds. A quantitative analysis of the data allowed us to give an estimation of the electronic relaxation and the correlation time for the electron-lattice interaction. The electronic relaxation time at low field is found to be sizably shorter than that estimated from extrapolation of EPR values. By increasing viscosity, the evidence of the contact contribution disappears and deviation from the Solomon behavior occurs. Theoretical calculations indicated that both the hyperfine coupling between the unpaired electron and the nucleus and the field dependence of the correlation time are responsible for the deviation.
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