Home 18-Krone-6 und kleine Carbonsäuren. Bildung und Struktur binärer Addukte mit Ameisen-und Essigsäure sowie ternärer mit Essigsäure und Wasser/18-Crown-6 and Small Carboxylic Acids. Formation and Structure of Binary Adducts with Formic and Acetic Acid, as well as Ternary Ones with Acetic Acid and Water
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18-Krone-6 und kleine Carbonsäuren. Bildung und Struktur binärer Addukte mit Ameisen-und Essigsäure sowie ternärer mit Essigsäure und Wasser/18-Crown-6 and Small Carboxylic Acids. Formation and Structure of Binary Adducts with Formic and Acetic Acid, as well as Ternary Ones with Acetic Acid and Water

  • Antje Albert and Dietrich Mootz
Published/Copyright: June 2, 2014
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Abstract

The melting diagrams of the binary systems 18-crown-6/formic acid and 18-crown-6/acetic acid have been set up and the crystal structures of the adducts 18C6 · 2 HCOOH (1, space group P 21/c with Z = 2 formula units per unit cell) and 18C6 · 2 CH3COOH (2, C2/m, Z = 2) determined. Furthermore three ternary phases, 18C6 · CH3COOH · H2O (3, P21/c, Z = 4) and dimorphic 18C6 · 2 CH3COOH · 4 H2O (high temperature form 4, P21/n, Z = 2; low temperature form 5, P21/n, Z = 2) have been characterized in the same way. In each structure the crown ether molecule has the (pseudo) D3d conformation common for many of its complexes. Various aspects of the intermolecular hydrogen bonding are described.

Received: 1997-10-29
Published Online: 2014-6-2
Published in Print: 1998-2-1

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