| | 1 | Author
| Hiroyuki Ishida, Setsuo Kashino, Ryuichi Ikeda | Requires cookie* | | | Title
| Crystal Structure of Trimethylammonium Tetrafluoroborate in Three Solid Phases  | | | | Abstract
| The crystal structure of (CH 3) 3 NHBF 4 was studied in three solid phases by X-ray diffraction techniques. The structures of the ionic plastic phase (Phase I) stable above 453 K and Phase II between 384 and 453 K are CsCl-type cubic (a = 5.772(4) Ä) and tetragonal (a = 9.815(5) and c = 6.895(5) A), respectively. The room temperature phase (Phase III) forms a monoclinic lattice (space group P2,/m, a = 5.7017(8), b = 8.5724(9), c = 7.444(1) Ä, and ß = 102.76(1)°). BF 4 ~ ions in this phase were shown to be disordered in four orientations. | | | |
Reference
| Z. Naturforsch. 55a, 765—768 (2000); received June 28 2000 | | | |
Published
| 2000 | | | |
Keywords
| Crystal Structure, X-ray Diffraction, Ionic Plastic Phase, Disorder | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0765.pdf | | | | Identifier
| ZNA-2000-55a-0765 | | | | Volume
| 55 | |
| 2 | Author
| Hiroyuki Ishida, Yoshihiro Kubozono, Setsuo Kashino, Ryuichi Ikeda | Requires cookie* | | | Title
| Crystal Structure of Trimethylammonium Perchlorate in Three Solid Phases Including the Ionic Plastic Phase Obtainable above 480 K | | | | Abstract
| The crystal structures of (CH3)3NHC104 in three solid phases were studied by X-ray diffraction techniques. X-ray powder patterns taken at ca. 500 and 445 K revealed that the plastic phase (Phase I) attainable above 480 K crystallizes in a CsCl-type cubic structure with a = 5.845 (1) A, Z = 1, V = 199.7 (2) Ä3, and Dx = 1.327 gem -3, while Phase II, stable between 480 and 396 K, forms a tetragonal structure with a = 9.912 (4), c = 7.01 (2) Ä, Z = 4, V = 689 (3) A3, and Dx = 1.54 gem -3. The room temperature phase (Phase III) was studied by single crystal X-ray diffraction and found to form a monoclinic lattice with space group P2X , a = 5.749(1), b = 8.670(1), c = 7.5585 (9) A, ß = 102.66 (1)°, Z = 2, V = 367.6 (2) A , and Dx= 1.441 g em -3. Thermal measurements, differential thermal analysis and differential scanning calorimetry, were carried out on these solid phases, and the obtained results were compared with those observed for (CH3)3NHBF4. | | | |
Reference
| Z. Naturforsch. 49a, 723—726 (1994); received March 12 1994 | | | |
Published
| 1994 | | | |
Keywords
| Crystal structure, X-ray diffraction, Thermal measurements, Ionic plastic phase | | | |
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| default:Reihe_A/49/ZNA-1994-49a-0723.pdf | | | | Identifier
| ZNA-1994-49a-0723 | | | | Volume
| 49 | |
| 3 | Author
| Hiroyuki Ishida, Masakazu Kato, Hiroshi Ono, Ryuichi Ikeda | Requires 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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| default:Reihe_A/52/ZNA-1997-52a-0637.pdf | | | | Identifier
| ZNA-1997-52a-0637 | | | | Volume
| 52 | |
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