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The crystal structures of five low-melting hydrates of n-alkane-α,ω-diamines, H 2 N(CH 2 ) n NH 2  · x H 2 O, for short Cn · x W, have been determined. As a common feature, the water molecules are mutually linked by hydrogen bonds O-H· · ·O to form low-dimensional polymers. These are a meandering chain in C 2  · 2 W (space group I 2/a, Z = 4 formula units per unit cell), a zig zag chain in C 6  · 2 W (P 2 1 /c, Z = 2), a ribbon of consecutively condensed five-membered rings in C 3  · 3 W (P 2 1 /c, Z = 4) and a layer of condensed and spiro-linked rings of varying size each in C 7  · 3 W (P 1̄, Z = 4) and C 4  · 5 W (C 2/c, Z = 4). Further hydrogen bonding, between the water polymers and the bifunctional amine molecules, leads to overall connectivities which are three-dimensional in each structure.

zeitschrift für naturforschung b

Di- bis Pentahydrate von fünf Alkylendiaminen. Eine Fallstudie zu ein- und zweidimensionalen Wasserpolymeren in Festkörpern/Di- to Pentahydrates of Five Alkylenediamines. A Case Study of One- and Two-Dimensional Water Polymers in Solids