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'Hydrogen bonding' in keywords Facet   Publication Year 1987  [X]
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1Author    Akinobu Sasane, Hisanori Shinohara, Yoshihiro Mori, Yoshio Kume, Tetsuo Asaji, Daiyu NakamuraRequires cookie*
 Title    A Temperature Dependence Study of 35 C1 Nuclear Quadrupole Resonance Frequencies in Some Hexachloroplatinate(IV) Hexahydrates  
 Abstract    The temperature dependence of 35 C1 NQR frequencies was investigated in various hexachloro-platinate(IV) hexahydrates containing the following divalent ions as counter cations: Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Ba(II). All of the compounds except the Cu(II) and Ba(II) salts yield a single 35 C1 NQR line at all temperatures studied. For the Mn(II), Cu(II), and Ba(II) salts, the NQR frequencies are considerably shifted by deuteration. For the deuterated Mn(II) salt, two 35 C1 NQR lines were observed whose relative peak-height intensities vary in dependence on the history of the thermal treatment of the sample. The very broad higher frequency line could be observed for a sample which had been at 77 K or below. It could not be observed for a sample which was cooled slowly to room temperature after it had been heated up to ca. 420 K. A structural phase transition was located at 135. 6 and 129. 4 K for the Cu(II) salt and its deuterated analog, respectively. The frequency shift by deuteration is discussed in relation to the strength of O-H ... CI type hydrogen bonds. 
  Reference    Z. Naturforsch. 42a, 611—616 (1987); received February 171987 
  Published    1987 
  Keywords    Magnetic resonance (NQR), hydrogen bonding, phase transition 
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 TEI-XML for    default:Reihe_A/42/ZNA-1987-42a-0611.pdf 
 Identifier    ZNA-1987-42a-0611 
 Volume    42 
2Author    Dietrich Mootz, Angelika Merschenz-QuackRequires cookie*
 Title    Zur Kenntnis der höchsten Hydrate der Schwefelsäure: Bildung und Struktur von H2S 0 4*6,5 H20 und H2S 0 4-8 H20 [1] On the Highest Hydrates of Sulfuric Acid: Formation and Structure of H 2S 0 4 -6.5 H 20 and H 2S 0 4-8 H 20 [1]  
 Abstract    The phase diagram of the system sulfuric acid-water in the range 80—100 mol % H20 was reinvestigated by low-temperature DTA and X-ray powder diffraction. The results are compared with other studies in the literature. The crystal structures of the hydrates H2S 0 4 • 6.5 H20 , melting incongruently at —54 °C, and H2S 0 4-8 H 20 (metastable) were determined to be those of oxonium salts, (H50 2)(H 70 3)S 0 4-1.5 H20 and (H50 2)2S 0 4-4 H20 , respectively. 
  Reference    Z. Naturforsch. 42b, 1231 (1987); eingegangen am 1. Juni 1987 
  Published    1987 
  Keywords    System H2S 0 4—H20, Sulfuric Acid, Hydrate Structures, Hydrogen Bonding, Oxonium Salts 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1231.pdf 
 Identifier    ZNB-1987-42b-1231 
 Volume    42