Arun, N. ; Vasudevan, S. ; Ramanathan, K. V. (2000) Effect of the extent of hydration on the motion of interlamellar water: a 1H NMR study of the ion-exchanged layered hydrates Cd0.75PS3Na0.5(H2O)y, y = 1, 2 Journal of Physical Chemistry B, 104 (39). pp. 9091-9098. ISSN 1520-6106
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp000620m
Related URL: http://dx.doi.org/10.1021/jp000620m
Abstract
Hydrated Na ions have been ion-exchange intercalated into layered cadmium thiophosphate to give Cd0.75PS3Na0.5(H2O)y. Two stable phases with y = 1 and 2 are obtained with lattice expansion 2.8 and 5.6 Å, respectively. The former phase is formed from the y = 2 phase either by evacuation or heating. The effect of the extent of hydration on the motion of interlamellar water has been investigated by analyzing the dipolar splittings observed in the 1H NMR spectrum as the system transforms from the y = 2 phase to the y = 1 phase. In the y = 2 phase the water molecules rotate about the interlamellar normal, C→*, as well as about their C→2 symmetry axis. On formation of the y = 1 phase there is partial loss of rotational freedom; rotational motion about the C→2 axis of the interlamellar water is now no longer present. We propose a simple electrostatic model to explain these results.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Chemical Society. |
| ID Code: | 58441 |
| Deposited On: | 31 Aug 2011 06:04 |
| Last Modified: | 31 Aug 2011 06:04 |
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