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Formation and Crystal Structures of the Hydrates of 18-Crown-6 [1]

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Published/Copyright: June 2, 2014
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 52 Issue 5

Abstract

The melting diagram of the system 18-crown-6/water has been set up and the existence of four binary hydrates confirmed. Crystal structures have been determined for three of these, in addition to that for the hexahydrate already published. The hydrates are monoclinic, a tetrahydrate (previously reported as a 4.5-hydrate) with space group P21/c and Z = 2 formula units per unit cell, an octahydrate with I2/a and Z = 4, and a dodecahydrate with P21/n and Z= 2. In each structure the crown ether molecule has the (pseudo) D3d conformation common for many of its complexes, and is immediately hydrogen-bonded by a group of four water molecules in a similar, characteristic pattern. In the tetrahydrate, with one of the waters disordered, the total connectivity is that of a 1D chain, while the overall structures of the octa-and dodecahydrate are 3D networks. Four of the six independent water molecules in the dodecahydrate are linked with each other into a rare 2D ice-like layer.

Keywords: Crown Ether; Crystal Structure; Hydrate; Hydrogen Bonding; Melting Diagram
Received: 1997-1-15
Published Online: 2014-6-2
Published in Print: 1997-5-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

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  1. Kantenverknüpfte VO6-0ktaeder und PO4-Tetraeder in BaCa(VO)(PO4)2 / Edge-Connected VO6 Octahedra and PO4 Tetrahedra in BaCa(VO)(PO4)2
  2. Geschlossene 1∞[(PtDy4O16)4]-Polyedertunnel in Ba13Dy8Zn4Pt4O37 Closed 1∞ [(PtDy4O16)4] Polyhedra Tunnels in Ba13Dy8Zn4Pt4O37
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  4. Quaternary Equiatomic Manganese Pnictide Oxides AMnPO (A = La-Nd, Sm, Gd-Dy), AMnAsO (A = Y, La-Nd, Sm, Gd-Dy, U), and AMnSbO (A = La-Nd, Sm, Gd) with ZrCuSiAs Type Structure
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  6. Synthese und Röntgenstrukturanalyse von [Fe(η6-C6H4{1,3-(CH3)2})(η5 -C5(C6H5)5]+ [FeCl4]- / Synthesis and X-Ray Structure Analysis of [Fe(η6-C6H4{1 ,3 -(CH3)2})(η5-C5(C6H5)5]+ [FeCl4]-
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https://doi.org/10.1515/znb-1997-0512
Keywords for this article
Crown Ether; Crystal Structure; Hydrate; Hydrogen Bonding; Melting Diagram

Articles in the same Issue

  1. Kantenverknüpfte VO6-0ktaeder und PO4-Tetraeder in BaCa(VO)(PO4)2 / Edge-Connected VO6 Octahedra and PO4 Tetrahedra in BaCa(VO)(PO4)2
  2. Geschlossene 1∞[(PtDy4O16)4]-Polyedertunnel in Ba13Dy8Zn4Pt4O37 Closed 1∞ [(PtDy4O16)4] Polyhedra Tunnels in Ba13Dy8Zn4Pt4O37
  3. Preparation and X-Ray Structure of
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  16. Die zu BaMg2Cu8V6O26 isotypen Cadmium-Kupferoxovanadate KCd0,67Cu4,33V3O13, RbCd0,5Cu4,5V3O13 sowie TlCd0,5Cu4,5V3O13 /The BaMg2Cu8V6O26 isotypic Cadmium-Cooperoxovanadates KCd0,67Cu4,33V3O13, RbCd0,5Cu4,5V3O13 and TlCd0,5Cu4,5V3O13 /
  17. Dicobaltoarsenat -(CoAsO7) -Baugruppen im Cobaltoxid-Tellurat Co6O2[T eO4(CoAsO5)2] / Dicobaltoarsenate - (CoAsO7) - Groups in the Cobalt Oxide Tellurate Co6O2[TeO4(CoAsO5)2]
  18. Kondensationsreaktionen von Trifluornitrosomethan CF3NO mit Sulfanilamid H2NC6H4SO2NH2-Darstellung von CF3NNC6H4SO2NH2, CF3NNC6H4SO2NNCF3, CH3C(O)N(H)C6H4SO2NNCF3 und CF3C(0)N (H)C6H4SO2NH2 / Condensation Reactions of Trifluoronitrosomethane CF3NO with Sulfanilamide H2NC6H4SO2NH2- Preparation of CF3NNC6H4SO2NH2, CF3NNC6H4SO2NNCF3, CH3C(0)N(H)C6H4SO2NNCF3 and CF3C(0)N (H)C6H4SO2NH2
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