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'Quadrupole Coupling Constant' in keywords
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2000 (1)
1998 (2)
1994 (1)
1Author    Mineyuki Hattori, Yoshito Onoda, Tomoki Erata, M. E. Smith, Bruker Analytische, M. Esstechnik, G. M. Bh, Masakazu Hattori, Hiroshi Ohki, Ryuichi IkedaRequires cookie*
 Title    Ionic motion and Disordered Structure in the Rotator Phase of Butylammonium Chloride Studied by Temperature Dependences of 35C1 and 2HNMR  
 Abstract    Temperature dependences o f 35C1 and 2H quadrupole coupling constants and 35C1 N M R spin-lat­ tice relaxation times in polycrystalline samples were measured in the rotator phase of the butylam ­ m onium chlorides C 4H 9N H 3C1 and C4H 9N D 3C1, obtainable above the phase transition tempera­ ture o f 241 K. A rapid decrease o f the quadrupole coupling constants of both nuclei upon heating is attributed to increasing dynam ic disorder formed around the polar head. The presence of self-dif-fussion o f C P ions was revealed from the spin-spin relaxation time and resonance line-width in single crystals, and confirmed by measuring the dc electrical conductivity. 
  Reference    Z. Naturforsch. 49a, 291 (1994); received July 23 1993 
  Published    1994 
  Keywords    Solid N M R, Quadrupole coupling constant, Spin-lattice relaxation time, Self-diffusion, Rotator phase 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0291.pdf 
 Identifier    ZNA-1994-49a-0291 
 Volume    49 
2Author    Naohiro Yoshida, Noriko Onoda-Yamamuro, Shin'. Ichi Ishimaru, Keizo Horiuchi, Ryuichi IkedaRequires cookie*
 Title    Temperature Dependence of 2 H Quadrupole Coupling Constants in 2 H 2 0 and Ionic Motions in Crystalline IM( 2 H 2 0) 6 ] ISnCl 6 ] (M: Mg, Ca), Studied by 2 H NMR and Neutron Powder Diffraction  
 Abstract    The temperature dependence of 2 H NMR spectra was measured at 130-430 K on [M(D 2 0) 6 ] [SnCl 6 ] (M : Mg, Ca) (rhombohedral, space group: R3), and neutron powder diffraction on the Mg salt was performed at room temperature. Based on the accurate orientation of D 2 0 molecules in an octahedral cation, spectra with a large asymmetry parameter rj, observed around 200 K, were explained by a model of 180° flip of water molecules. Another motional narrowing observed above room temperature was assigned to a cationic overall reorientation about the C 3 -axis. 
  Reference    Z. Naturforsch. 53a, 473—479 (1998); received October 31 1997 
  Published    1998 
  Keywords    2 H NMR, Neutron Diffraction, Molecular Motion, Quadrupole Coupling Constant, Spectrum Lineshape 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0473.pdf 
 Identifier    ZNA-1998-53a-0473 
 Volume    53 
3Author    Hiroshi Miyoshi, Keizo Horiuchi, Narumi Sakagami, Kenichi Okamoto, Ryuichi IkedaRequires cookie*
 Title    C1 NQR, *H NMR, and X-Ray Diffraction Studies in a Hydrogen Bonded Complex Na 2 PtCl 6 * 6H z O  
 Abstract    The 35 C1 NQR frequencies, spin-lattice relaxation time and X H NMR relaxation time were measured on crystalline Na 2 PtCl 6 • 6H z O at 77-350 K. The presence of three nonequivalent chlo-rine sites found by X-ray diffraction measurement is in agreement with the observed three NQR lines, which have different temperature dependences attributable to differences in the direction of H-bonding with water molecules. The three NQR lines correspond to three kinds of chlorines with different Pt-Cl distances and H-bond directions. 
  Reference    Z. Naturforsch. 53a, 603—607 (1998); received October 31 1997 
  Published    1998 
  Keywords    CI NQR, X-Ray Diffraction, Spin-Lattice Relaxation, Quadrupole Coupling Constant, Hydrogen Bond 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0603.pdf 
 Identifier    ZNA-1998-53a-0603 
 Volume    53 
4Author    Shuan Dong, Kazuhiko Yamada, Gang WuRequires cookie*
 Title    Oxygen-17 Nuclear Magnetic Resonance of Organic Solids  
 Abstract    We report solid-state l7 0 NMR determinations of the oxygen chemical shift (CS) and electric field gradient (EFG) tensors for a series of 17 0-enriched organic compounds containing various functional groups. In several cases, analysis of the n O magic-angle-spinning (MAS) and static NMR spectra yields both the magnitude and relative orientations of the 17 0 CS and EFG tensors. We also demonstrate the feasibility of solid-state 17 0 NMR as a potentially useful technique for studying molecular structure and hydrogen bonding. 
  Reference    Z. Naturforsch. 55a, 21—28 (2000); received September 11 1999 
  Published    2000 
  Keywords    Oxygen-17, Solid State NMR, Organic Compounds, Chemical Shift Tensor, Quadrupole Coupling Constant 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0021.pdf 
 Identifier    ZNA-2000-55a-0021 
 Volume    55