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'M olecular dynamics Nuclear relaxation' in keywords Facet   Publication Year 1994  [X]
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1Author    Keizo HoriuchiRequires cookie*
 Title    35C1 NQR Spin-Lattice Relaxation Mechanism in Ni(H20 ) 6SnCl6 and M g(H20 ) 6SnCl6 Crystals  
 Abstract    The 35C1 N Q R spin-lattice relaxation mechanism in isom orphous N i(H 20) 6SnCl6 and M g(H 20) 6SnCl6 crystals is reported. The spin-lattice relaxation time T1(j in the N i com pound is determined mainly by a paramagnetic relaxation. However, above ca. 400 K T1Q decreased rapidly and a log vs. T 1 curve was almost linear. This steep decrease of T1Q was explained by reorientational m otions of the anions with an activation energy o f 73 kJm ol" 1. In addition, a double minimum in Tin, which can be interpreted as arising from the fluctuation o f the electric field gradient (EFG) at the chlorine site caused by cationic thermal m otions, was observed around room temper­ ature. The temperature dependence of the 35C1 N Q R r iQ in the M g salt is re-analysed in the light of the EFG -m odulation effect caused by a 180° flip m otion of the H 20 molecules and an overall reorientational m otion of the [M g(H20) 6]2+ octahedral cations as a whole. 
  Reference    Z. Naturforsch. 49a, 286 (1994); received O ctober 16 1993 
  Published    1994 
  Keywords    Complex com pounds, M olecular dynamics Nuclear relaxation, Nuclear quadrupole resonance Electric field gradient 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0286.pdf 
 Identifier    ZNA-1994-49a-0286 
 Volume    49