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Proton NMR relaxation study of the motion of water molecules in hydrated nitroprussides

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
54
Issue
1
Identifiers
DOI: 10.1016/0022-3697(93)90123-9
Keywords
  • Hydrated Nitroprussides
  • Proton Relaxation
  • Flip Motion
  • Nmr

Abstract

Abstract The proton spin-lattice relaxation time, T 1 has been measured as a function of temperature in some polycrystalline hydrated nitroprussides: K 2[Fe(CN) 5NO] · 2.5H 2O (KNP), Sr[Fe(CN) 5NO] · 4H 2O (SrNP) and Ba[Fe(CN) 5NO] · 3H 2O (BaNP). A 180° flip motion of the water molecule about its quasi-twofold axis has been found to be responsible for the relaxation in the temperature range studied (180–335 K). The activation energies of this motion are 16.29, 16.37 and 26.88 kJ m −1 for KNP, SrNP and BaNP, respectively. The structural influence on the activation energy of the water flip motion is also discussed for the hydrates studied.

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