| | 1 | Author
| Masao Hashimoto, Shuji Matsumoto, Masakazu Kunitomo, Haruo Niki, Hirotaka Odahara, Katsuji Tamaki | Requires cookie* | | | Title
| 35C1 NQR Relaxation and Hydrogen Bond in Some Chloral Hemiacetals  | | | | Abstract
| The crystal structure of chloral ethylhemiacetal has been determined at 291 K: monoclinic, space group C f -P 2 lt Z = 2, a = 854.5(1), b = 594.0(3), c = 853.3(1) pm, ß = 108.30(2)°, R = 0.0962. A sharp decrease of the spin lattice relaxation time 7i found for the 35C1 N Q R o f the CC13 groups in chloral methyl-, ethyl-and n-heptylhemiacetals is attributed to the onset of reorientation of the group over a potential barrier o f ca. 39, 37, and 32 kJ/m ol, respectively. An unusual vs. 1/T curve with a 7i minimum superimposed on the sharp decrease of 7\ due to the reorientation was observed for each of the three Cl N Q R lines of nH p-C H . This phenom enon is tentatively ascribed to a fluctuation of EFG caused by jum ping m otion o f the hydrogen atom s in the OH groups. | | | |
Reference
| Z. Naturforsch. 49a, 279 (1994); received August 16 1993 | | | |
Published
| 1994 | | | |
Keywords
| Crystal structure, Hydrogen bond, Chlorine N Q R, Spin lattice relaxation | | | |
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| ZNA-1994-49a-0279 | | | | Volume
| 49 | |
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