Abstract
The relaxation times T1, and T1ρ, and T1D of protons in (NH4)2N2H6(ClO4)4 were measured in the temperature range from 77 to 430 K. T1 measurements were made at 36 and 18 MHz, and T1ρ measurements were made as a function of H1. The temperature and frequency dependence of T1 is explained in terms of dipole–dipole interactions within anisotropically reorienting NH3 groups and spin-rotational interactions within reorienting NH+4 ions. The value of the T1ρ minimum due to reorienting NH3 groups is unusually large with weak H1 dependence, possibly due to tunneling motions. The T1ρ measurements exhibit a strong H1 dependence on the high-temperature side of the T1ρ minimum. An analysis of the H1 dispersion in terms of cross relaxation between protons and nitrogen nuclei within the N2H++6 ions has yielded values for the nitrogen T1.
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