Hydrogen banded 1,10-diammoniodecane - an example of an organo-template for the crystal engineering of polymeric polyiodides

Using the rod-like 1,10-diammoniodecane (dadH(2)) as a template it is possible to synthesize and crystallize the two polyiodide compounds (dadH(2))(2)I-2[I-3](2) (1) and dadH(2)[I-3]2.I-2.2H(2)O (1). Compound 1 crystallizes in the polar monoclinic space. group P2(1) with eight iodine atoms and two all-trans conformated 1,10-diammoniodecanes in the asymmetric unit. The structure is built by the dications and the two iodide anions forming a hydrogen bonded framework in which channels contain the two crystallographically independent I-3 anions. These I-3(-) anions are interconnected via extremely weak I...I interactions to a one-dimensional polymer with the I-3 units linked to each other. They (to not form hydrogen bonds of 'reasonable strength to the host framework. Compound 2 crystallizes in the centrosymmetric space group. P2(1)/n. The 1,10-dianimonioalkane cations are lying on centres of symmetry and are showing an all-trans conformation. These cations form a sub-structure that is boils by hydrogen bonded ribbons of 1,10-diammoniodecanes and water molecules in the ratio 1 :2. These ribbons act as polymeric templates for the formation of a iodine iodide framework. This anionic substructure is best described as a three-dimensional framework built by 1, molecules and I3 unions showing the habit of a herring-bone motif. Neglecting the weak I...I interactions of ca. 4 Angstrom the polyiodide framework can be separated into outstretched, Z-shaped [I-3...I-2...I-3](2..) sub-units lying oil centres of symmetry. In the Structures of the compounds 1 and 2, the 1,10-diammoniodecane cations form hydrogen bonded ring motifs that may be classified to Etter's rules as R-4(2)(30) with the iodide anions in 1 and water molecules in 2 acting as hydrogen bound acceptors. The crystal structure of the 1, 10-diaminodecane (3) has been determined. This 'soft as butter' material crystallizes in the centrosymmetric space group Pbca with the molecules lying on a centre of symmetry and shows nearly ideal all-traps conformation. Only weak N-H...N hydrogen bonds occur between neighbouring molecules to form a layered structure. The molecules are arranged in the ac plane to form a herring-bone motif with the building ring motifs classified according Etter's rules with the symbol R-4(4)(30).