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The proton spin-lattice relaxation time T 1  (at 5.4, 10 and 15 MHz) and second moment M 2  (at 9.8 MHz) have been measured in hydrazinium Perchlorate (N 2 H 5 ClO 4 ). The temperature dependence of T, shows two minima. The low temperature T, minimum has been explained in terms of NH 3  reorientation about the N-N axis while the high temperature minimum is attributed to the exchange of protons within the NH 2  group (180° flip about the H - N - H bisectrix). The activation energies for NH 3  and NH: motions are found to be 20.5 kJ mol -1  and 39.8 kJ mol -1  , respectively. The second moment variation with temperature shows two transitions around 120 K and 210 K and has been discussed in terms of NH 3 /NH 2  motions.

Proton NMR Study of Molecular Dynamics in Hydrazinium Perchlorate