Ramesh, KP and Devaraj, N and Ramakrishna, J and Venu, K and Sastry, VSS (1993) Proton NMR study of molecular dynamics in ammonium tribromo stannate (NH4SnBr3). In: Spectrochimica Acta Part A: Molecular Spectroscopy, 49 (12). pp. 1773-1778.
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The proton second moment M2 and spin-lattice relaxation time T1 have been measured in ammonium tribromo stannate (NH4SnBr3) in the temperature range 77–300 K, to determine the ammonium dynamics. The continuous wave signal is strong and narrow at 77 and 300 K but has revealed an interesting intensity anomaly between 210 and 125 K. T1 shows a maximum (13 s) around 220 K. No minimum in the T1 vs 1000/T plot was observed down to 77 K. M2 and T1 results are interpreted in terms of NH+4 ion dynamics. The activation energy Ea for NH+4 ion reorientation is estimated to be 1.4 kcal mol−1.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||24 Feb 2011 05:46|
|Last Modified:||24 Feb 2011 05:46|
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