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'Hydrogen bonding' in keywords Facet   Publication Year 1984  [X]
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1Author    Dietrich Mootz, Wolfgang PollRequires cookie*
 Title    Fluoride und Fluorosäuren, VI Verbindungsbildung und Kristallstrukturen im System Ammoniak—Fluorwasserstoff [ 1 , 2 ] Fluorides and Fluoro Acids, VI Com pound Form ation and Crystal Structures in the System A m m onia-H ydrogen Fluoride  
 Abstract    The melting diagram of the quasi-binary system NH3— HF between the limits NH4HF: and HF was redetermined. The compounds NH 3 • 4H F. NH3 • 5HF and NH3 ■ 8HF with melting points of 26. —14 (dec.) and —95 °C (dec.), respectively, were established as the stable phases. Their crystal structures were determined as those of ammonium hydrogen fluorides NH4[F(HF)3], NH4[F(HF)4] and NH4[HF:(H F)3] • 3HF with extended N -H --F and F -H -F hydrogen bonding. 
  Reference    Z. Naturforsch. 39b, 290—297 (1984); eingegangen am 15. September 1983 
  Published    1984 
  Keywords    System NH3 — HF, Melting Diagram Crystal Structure, Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0290.pdf 
 Identifier    ZNB-1984-39b-0290 
 Volume    39 
2Author    Dietrich Mootz, D. Agm Ar BoenigkRequires cookie*
 Title    Fluoride und Fluorosäuren, VII [1] Kristallstrukturen von Säurehydraten und Oxoniumsalzen, XXII [2] Hydratbildung der Trifluoressigsäure sowie Strukturen eines Monohydrats und eines Tetrahydrats [3] Fluorides and Fluoro Acids, VII [1] Crystal Structures of Acid H ydrates and Oxonium Salts, XXII [2] H ydrate Form ation of Trifluoroacetic Acid and Structures of a M onohydrate and a Tetrahydrate [3]  
 Abstract    The liquidus and solidus lines of the quasi binary system CF3C O O H —H20 were determined by low temperature difference thermal analysis and the resulting phase relations controlled by X-ray powder diffraction. Formation of a monohydrate and a tetrahydrate, melting congruently at —43 and —16 °C, respectively, is confirmed. In addition a metastable form of the monohydrate and a low temperature form of the tetrahydrate, stable below —47 °C, are indicated. The crystal struc­ tures of the stable high temperature forms were determined. From these the monohydrate (tetra­ gonal, space group I42d, Z = 16) is a true acid hydrate, C F ,C 0 0 H H 20 . and the tetrahydrate (triclinic, P I, Z -2) a hydrated oxonium salt, (H 50 2) + [H(CF3COO)2]~ • 6 H:0 . 
  Reference    Z. Naturforsch. 39b, 298—3 (1984); eingegangen am 8. November 1983 
  Published    1984 
  Keywords    Trifluoroacetic Acid, Hydrates, Phase Diagram, Crystal Structure, Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0298.pdf 
 Identifier    ZNB-1984-39b-0298 
 Volume    39