J. Granot, D. Fiat
Sep 1, 1975
Citations
0
Influential Citations
10
Citations
Journal
Journal of Magnetic Resonance
Abstract
Abstract Proton field shifts in dysprosium perchlorate aqueous solutions were measured as function of temperature and dysprosium concentration. The contact and pseudo-contact shifts were separated by means of a least-squares method based on their different temperature variation (as T −1 and T −2 , respectively). The hyperfine coupling constant between the dysprosium unpaired electrons and the proton nuclei, and the spin density at the proton nuclei were calculated. The results were compared with those obtained for other lanthanides and interpreted in terms of structural changes. Linewidth measurements yielded an estimation for the water exchange rate. The electronic relaxation times were calculated and the activation energies for the relaxation processes present in the solution were obtained.