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'Barium Hydroxide Halides' in keywords
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1991 (1)
1989 (1)
1Author    HeinzDieter Lutz, Thomas Kellersohn, Konrad BeckenkampRequires cookie*
 Title    Zur Kenntnis der Hydroxidhalogenide des Bariums  
 Abstract    Kristallstruktur und Schwingungsspektren von Ba[0(H,D)]X • 2 (H ,D)20 (X = CI, Br) Barium Hydroxide Halides. Crystal Structure and Vibrational Spectra of Ba[0(H ,D)]X-2(H ,D)20 (X = Cl, Br) a (0 H)2-B aX 2 -H 20 (X = CI. Br) The quaternary systems B a(O H)2—BaCl2—H 20 and B a(O H)2—BaBr2—H 20 were studied with the help of X-ray and neutron diffraction as well as IR , Raman, D T A , and TG methods. The following compounds have been established or confirmed: B a(O H)Cl hH 20 (n = 0, 1/2, 2) and B a (0 H)B r-«H 20 (n = 0, 1/2, 2). The crystal structures (of hitherto unknown structure type) of B a (0 H)C l-2 H :0 and B a (0 D)C l-2 D 20 were determined by single crystal X-ray methods and neutron powder diffraction (space group P4Inmm, Z = 2, 621 unique reflections, R — 8 . 8 and 1.9%, respectively). Whereas the hydroxide ion in this layer structured compound is non-hydrogen bonded, i.e. no H-bond donor group, nor it is bound to the Ba:+ ions, the water molecules are involved in strong H-bonds to adjacent O H " ions. The coordination of the barium ions is monocapped tetragonal antiprismatic (4 H 20 and 5 halide ions). The IR and Raman spectra of B a (0 H)X -2 H :0 (X = Cl. Br) are assigned and discussed in terms of hydrogen bonding, isotopic shifts, and intermolecular coupling of the bands observed. The stretching modes of the O H " ions (3672 and 3667 cm-1, 95 K) are shifted to higher wavenumbers by about 100 cm"' as compared with those of free O H -ions. 
  Reference    Z. Naturforsch. 44b, 928 (1989); eingegangen am 6. Februar/7. April 1989 
  Published    1989 
  Keywords    Crystal Structure, Barium Hydroxide Halides, Infrared Spectra, Raman Spectra, System: B 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-0928.pdf 
 Identifier    ZNB-1989-44b-0928 
 Volume    44 
2Author    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