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1Author    Hiroyuki Ishida, Yoshihiro FurukawaRequires cookie*
 Title    Self-Diffusion in the Ionic Plastic Phase of (CH 3 ) 3 NHC10 4 Studied by *H NMR and Electrical Conductivity  
 Abstract    Spin-lattice relaxation times (7^) and spin-spin relaxation times (T 2) of 'H NMR and the electrical conductivity (er) of trimethylammonium Perchlorate were measured in the ionic plastic phase obtainable above 480 K. In this phase, both the cation and anion were revealed to perform self-diffusion. The activation energy (£ a) of the cationic diffusion was evaluated to be 55 ±4 and 50 + 4kJmol _1 from 7j and 'H 7 2 respectively, while E a of the anionic diffusion was 64 ±3 kJ mol" 1 from the electrical conductivity. 
  Reference    Z. Naturforsch. 51a, 83—86 (1996); received December 4 1995 
  Published    1996 
  Keywords    Ionic plastic phase Self-diffusion, Nuclear magnetic resonance, Electrical conductivity 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0083.pdf 
 Identifier    ZNA-1996-51a-0083 
 Volume    51 
2Author    Hiroyuki IshidaRequires cookie*
 Title    H and 19 F NMR Studies on Molecular Motions in Two Solid Phases of t-Butylammonium Tetrafluoroborate  
 Abstract    Differential thermal analysis (DTA), differential scanning calorimetry (DSC), and the temperature dependence of the spin-lattice relaxation time (T {) and the second moment (M 2) of 1 H and F NMR were studied in (CH3) 3 CNH 3 BF4 and (CH 3) 3 CND 3 BF 4 . DTA and DSC revealed a solid-solid phase transition at 219 K for (CH 3) 3 CNH3BF4 and at 221 K for (CH 3) 3 CND 3 BF 4 . The motions of cations and anions in the two solid phases were studied by T x and M 2 experiments. The motional modes of the ions and their motional parameters were determined. 
  Reference    Z. Naturforsch. 53a, 796—800 (1998); received May 30 1998 
  Published    1998 
  Keywords    Molecular motion, Phase transition, Nuclear magnetic resonance 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0796.pdf 
 Identifier    ZNA-1998-53a-0796 
 Volume    53 
3Author    Hiroyuki Ishida, Naoki Kumagae, Setsuko SatoaRequires cookie*
 Title    Motions of Ethylammonium Ions in Solid Ethylammonium Chloranilate Studied by 1H Nuclear Magnetic Resonance  
 Abstract    The motions of the ethylammonium ion in solid ethylammonium chloranilate, C2H5NH3 • Q H O 4CI2, are studied by *H NMR second moment (M2) and spin-lattice relaxation time {Tx) measurements. Re­ orientations of the CH3 group about the C-C bond axis and the NH3 group about C -N bond axis were observed and their motional parameters were evaluated. The internal rotational barriers of the CH3 and NH3 groups of an isolated C2H5NH3 ion were estimated from ab initio molecular orbital calculations. 
  Reference    Z. Naturforsch. 56a, 523 (2001); received April 30 2001 
  Published    2001 
  Keywords    Nuclear Magnetic Resonance, Molecular Motion, Ethylammonium Ion, HF 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0523.pdf 
 Identifier    ZNA-2001-56a-0523 
 Volume    56 
4Author    Hartmut Vergin, Hermann Bauer, Gisela Kuhfittig, Wolfgang VoelterRequires cookie*
 Title    Investigations on the Configuration of 4-Nitro Imidazole Nucleosides  
 Abstract    It is demonstrated that the 220 — 225 nm Cotton effect of 4-nitro imidazole nucleosides can be used for the determination of the configuration of this class of compounds. A more detailed picture about conformation and configuration of the sugar residue is received from the copper-ammonia complexes of these nucleosides. The pH-dependency of the stability and the complex ratio are discussed for a furanose moiety. Correlation between signs and intensities of the Cotton effects and configurations and conforma-tions of the diol structures are discussed. 
  Reference    (Z. Naturforsch. 27b, 1378—1385 [1972]; eingegangen am 2. Juni/7. August 1972) 
  Published    1972 
  Keywords    Nucleosides, Circular Dichroism, Nuclear Magnetic Resonance, Carbohydrate Copper Complexes 
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 TEI-XML for    default:Reihe_B/27/ZNB-1972-27b-1378.pdf 
 Identifier    ZNB-1972-27b-1378 
 Volume    27 
5Author    Hiroyuki Ishida, Masakazu Kato, Hiroshi Ono, Ryuichi IkedaRequires cookie*
 Title    Cationic Self-diffusion in Solid Choline Perchlorate Studied by NMR  
 Abstract    The 1 H spin-lattice and spin-spin relaxation times, and the second moment of the 1 H NMR linewidth of choline Perchlorate, [(Cff^NCfFCHiOHJClC^, were measured in its highest-temperature solid phase, i. e. above 275 K. X-ray powder patterns taken at ca. 380 K revealed that in this phase the crystal has a CsCl-type cubic structure (a = 6.326(4) A and Z = 1). From *H NMR experiments it was found that the cations in this phase undergo isotropic rotation and translational self-diffusion. From the 1 H T, measurements, the activation energies of the cationic rotation and self-diffusion were evaluated to be 21.4 ± 0.4 and 62 ± 3 kJ mol -1 , respectively. 
  Reference    Z. Naturforsch. 52a, 637—639 (1997); received May 28 1997 
  Published    1997 
  Keywords    Ionic plastic phase, Self-diffusion, Crystal structure, Nuclear magnetic resonance 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0637.pdf 
 Identifier    ZNA-1997-52a-0637 
 Volume    52 
6Author    Hiroyuki IshidaRequires cookie*
 Title    H NMR Study of Ionic Motions in High Temperature Solid Phases of (CH 3 NH 3 ) 2 ZnCl 4  
 Abstract    The reorientation of the tetrahedral complex anion ZnCl 4 2-and the self-diffusion of the cation in (CH 3 NH3) 2 ZnCl4 were studied by 'H NMR spin-lattice relaxation time ('H T X) experiments. In the second highest-temperature phase, the temperature dependence of *H T X observed at 8.5 MHz could be explained by a magnetic dipolar-electric quadrupolar cross relaxation between 'H and chlorine nuclei, and the activation energy of the anion motion was determined to be 105 kJ mol -1 . In the highest-temperature phase, the activation energy of the self-diffusion of the cation was determined to be 58 kJ mol -1 from the temperature and frequency dependence of 'H T X . 
  Reference    Z. Naturforsch. 55a, 412—114 (2000); received January 8 2000 
  Published    2000 
  Keywords    Nuclear Magnetic Resonance, Molecular Motion, Cross Relaxation, (C^N^^ZnCfj 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0412.pdf 
 Identifier    ZNA-2000-55a-0412 
 Volume    55 
7Author    Keizo Horiuchi, Daiyu NakamuraRequires cookie*
 Title    Chlorine Nuclear Spin-Spin Relaxation Mechanism in Mg(H 2 0) 6 SnCl 6 as Studied by NQR and NMR Techniques  
 Abstract    The 35 C1 NQR spin-lattice relaxation time T1Q, spin-spin-relaxation time T2Q, and J H NMR spin-lattice relaxation time in the rotating frame T le in Mg(H20)6SnCl6 were measured as functions of temperature. Above room temperature T2q increased rapidly with increasing temperature, which can be explained by fluctuations of the local magnetic field at the chlorine nuclei due to cationic motions. From the T le experiments, these motions are found to be attributable to uniaxial and overall reorientations of [Mg(H20)6] 2+ ions with activation energies of 95 and 116 kJ mol -1 , respectively. Above ca. 350 K, T1Q decreased rapidly with increasing temperature, which indicates a reorientational motion of [SnCl6] 2-ions with an activation energy of 115 kJ mol -1 . 
  Reference    Z. Naturforsch. 47a, 277—282 (1992); received October 29 1991 
  Published    1992 
  Keywords    Complex compounds, Molecular dynamics, Nuclear relaxation, Nuclear quadrupole resonance, Nuclear magnetic resonance 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0277.pdf 
 Identifier    ZNA-1992-47a-0277 
 Volume    47 
8Author    Ryszard Stolarski, Mieczyslaw Remin, David ShugarRequires cookie*
 Title    Studies on Prototropic Tautomerism in Neutral and Monoanionic Forms of Pyrimidines by Nuclear Magnetic Resonance Spectroscopy  
  Reference    (Z. Naturforsch. 32c, 894 [1977]; received August 1/September 19 1977) 
  Published    1977 
  Keywords    Pyrimidines, Prototropic Tautomer Populations, Nuclear Magnetic Resonance, 1H and 13C Chemical Shifts, 1H, *H Coupling Constants 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0894.pdf 
 Identifier    ZNC-1977-32c-0894 
 Volume    32