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1990 (1)
1987 (1)
1Author    Akinobu Sasane, Hisanori Shinohara, Yoshihiro Mori, Yoshio Kume, Tetsuo Asaji, Daiyu NakamuraRequires cookie*
 Title    A Temperature Dependence Study of 35 C1 Nuclear Quadrupole Resonance Frequencies in Some Hexachloroplatinate(IV) Hexahydrates  
 Abstract    The temperature dependence of 35 C1 NQR frequencies was investigated in various hexachloro-platinate(IV) hexahydrates containing the following divalent ions as counter cations: Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Ba(II). All of the compounds except the Cu(II) and Ba(II) salts yield a single 35 C1 NQR line at all temperatures studied. For the Mn(II), Cu(II), and Ba(II) salts, the NQR frequencies are considerably shifted by deuteration. For the deuterated Mn(II) salt, two 35 C1 NQR lines were observed whose relative peak-height intensities vary in dependence on the history of the thermal treatment of the sample. The very broad higher frequency line could be observed for a sample which had been at 77 K or below. It could not be observed for a sample which was cooled slowly to room temperature after it had been heated up to ca. 420 K. A structural phase transition was located at 135. 6 and 129. 4 K for the Cu(II) salt and its deuterated analog, respectively. The frequency shift by deuteration is discussed in relation to the strength of O-H ... CI type hydrogen bonds. 
  Reference    Z. Naturforsch. 42a, 611—616 (1987); received February 171987 
  Published    1987 
  Keywords    Magnetic resonance (NQR), hydrogen bonding, phase transition 
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 TEI-XML for    default:Reihe_A/42/ZNA-1987-42a-0611.pdf 
 Identifier    ZNA-1987-42a-0611 
 Volume    42 
2Author    Juan Murgich, Ismardo Bonalde, JoseA. AbaneroRequires cookie*
 Title    N Nuclear Quadrupole Resonance Study of the Phase Transitions of Ba[Fe(CN) 5 N0] -3H 2 0  
 Abstract    The 14 N nuclear quadrupole resonance (NQR) of the cyanides in Ba[Fe(CN) s NO] • 3H 2 0 (BNP) was observed between 77 and 293 K. Phase transitions exist at 118,131 (both weakly first order) and 233 K (second order). Most of the cyanides were perturbed by the structural changes except for one of the trans cyanides that was only affected by the transition at 131 K. The mechanism of the phase transitions is interpreted in terms of soft modes resulting from the ion rearrangement produced by the slowing down of the water molecules upon cooling. A comparison of the NQR spectrum of BNP with that of Na ? [Fe(CN) 5 NO] • 3H 2 0 showed that the substitution of Na + by Ba 2 produced only minor changes in the charge distribution of the nitroprusside ion. 
  Reference    Z. Naturforsch. 45a, 353—356 (1990); received August 25 1989 
  Published    1990 
  Keywords    Magnetic Resonance (NQR), Nitroprussides, Phase Transitions 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0353.pdf 
 Identifier    ZNA-1990-45a-0353 
 Volume    45