1H and2H NMR Relaxation in Hydrogen-Bonded Solids Due to a Complex Motion: Classical Jumps over a Barrier and Incoherent Tunneling
✍ Scribed by E.C. Reynhardt; L. Latanowicz
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 351 KB
- Volume
- 130
- Category
- Article
- ISSN
- 1090-7807
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✦ Synopsis
Equations for the temperature dependence of proton and deu-Therefore, these solids have double potential minima with teron spin-lattice relaxation rates and second moments due to a equilibrium configurations A, B, and double (C, C configcomplex motion consisting of classical jumps over a potential barurations) or single (D configuration) potential maxima, as rier and quantum mechanical tunneling through the barrier have shown in Fig. 1. Hydrogen-bonded naphthazarines are parbeen derived. Asymmetric double and triple potential wells are ticularly suitable for detailed investigations of the energetics considered. These equations have been employed to analyze proton and dynamics associated with the proton transfer process. spin-lattice relaxation data for solid naphthazarin in the labora-Reynhardt (11) measured proton spin-lattice relaxation tory and rotating frames as a function of temperature. It is shown times of the B and C modifications of naphthazarin (5, 9) that tunneling plays an important role in the proton transfer dyas a function of temperature. A relaxation model in which the namics of this compound.