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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 2 1 /c with Z = 2 formula units per unit cell) and 18C6 · 2 CH 3 COOH (2, C2/m, Z = 2) determined. Furthermore three ternary phases, 18C6 · CH 3 COOH · H 2 O (3, P2 1 /c, Z = 4) and dimorphic 18C6 · 2 CH 3 COOH · 4 H 2 O (high temperature form 4, P2 1 /n, Z = 2; low temperature form 5, P2 1 /n, Z = 2) have been characterized in the same way. In each structure the crown ether molecule has the (pseudo) D 3d  conformation common for many of its complexes. Various aspects of the intermolecular hydrogen bonding are described.

zeitschrift für naturforschung b

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