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1996[X]
1Author    A. Ishikawa, A. Sasane, Y. Hirakawa, Y. MoriRequires cookie*
 Title    Motion of Water Molecules and Hydrogen Bonds in Zinc Hexachlorostannate (IV) Hexahydrate as Studied by *H NMR and 35 C1 NQR  
 Abstract    The *H NMR spin-lattice relaxation time 7\, 35 C1 NQR frequency VQ, and 35 C1 NQR spin-lattice relaxation time 7\ Q of [Zn(H 2 0) 6 ] [SnCl 6 ] (zinc hexachlorostannate(IV) hexahydrate) have been measured at temperatures between 77 and 350 K. The NQR spin echo signal with Vq— 15.689 MHz at 77 K showed a positive temperature coefficient attributable to O-H-Cl type H-bonds in the crystal. v Q at 77 K is strongly correlated with the electronegativity Xm of the metal M in the series of stannates [M(H 2 0) 6 ] [SnCl 6 ] (M = Mg, Ca, Mn, Co, Ni, Zn). A 7\ minimum observed for the Zn salt is ascribed to 180° flips of water molecules with an activation energy of 20 kJ mol -1 . The motion is influenced by repulsive forces among the water molecules within a cation rather than by attractive forces between the H-bonded H and CI atoms. 7\q proved to be mainly governed by lattice vibrations, weakly modulated by the fluctuating electric field gradient caused by the 180° flip motions. 
  Reference    Z. Naturforsch. 51a, 693—697 (1996); received October 10 1995 
  Published    1996 
  Keywords    'H NMR spin-lattice relaxation, 35 C1 NQR frequency, 35 C1 NQR spin-lattice relaxation, H-bonding, Electronegativity 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0693.pdf 
 Identifier    ZNA-1996-51a-0693 
 Volume    51