| | 1 | Author
| Thom As Kellersohn, Konrad Beckenkamp, HeinzDieter Lutz | Requires cookie* | | | Title
| Extrem asymmetrisch gebundene Wassermoleküle - Kristallstrukturen von Sr(OH)Cl * 4 H zO, Sr(OH)Br * 4 H 20 und Ba(O H )I * 4 H 20 Extremely Asymmetrically Bound W ater Molecules - Crystal Structures of Sr(OH)Cl * 4 H 70 , Sr(OH)Br * 4 H 20 , and Ba(OH)I -4 H 20  | | | | Abstract
| The crystal structures o f isotypic Sr(OH)Cl 4 H 20 , Sr(OH)Br ■ 4 H zO, and Ba(OH)I ■ 4 H 20 are repojted. The title compounds crystallize in a hitherto unknown structure type, space group P i, Z = 2. The final R values obtained are 0.0261, 0.069, and 0.062, respectively. The coordination o f the metal ions is monocapped square antiprismatic with 7 H2Ö, 1 OH~ and 1 halide ion. The halide ions separate metal/water/hydroxide layers. Each o f the four crystallo-graphically different water molecules serves as donor for one very strong and one very weak hydrogen bond and, hence, is extremely asymmetrically bound. Owing to this strong distor tion, the largest one known so far, the OH stretching vibrations o f the H 20 m olecules are intramolecularly decoupled as shown from vibrational spectra. The enthalpies o f dehydration obtained from differential scanning calorimetry are reported. | | | |
Reference
| Z. Naturforsch. 46b, 1279—1286 (1991); eingegangen am 22. April 1991 | | | |
Published
| 1991 | | | |
Keywords
| Strontium Hydroxide Halides, Barium Hydroxide Halides, Crystal Structure, Hydrates, Asymmetrically Bound H 20 | | | |
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| ZNB-1991-46b-1279 | | | | Volume
| 46 | |
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