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1Author    Thom As Kellersohn, Konrad Beckenkamp, HeinzDieter LutzRequires 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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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1279.pdf 
 Identifier    ZNB-1991-46b-1279 
 Volume    46