A series of Zn(II) complexes with N,N 0 -di(4-pyridyl)adipoamide ligands, {[ZnX 2 (L)]$H 2 O} N (X ¼ Cl, 1, Br, 2 and I, 3; L ¼ N,N 0 -di(4-pyridyl)adipoamide), [Zn 2 X 4 (L) 2 ]$2DMF (X ¼ Cl, 4 and Br, 5) and [Zn 2 I 4 (L) 2 ]$4DMF$C 4 H 10 O, 6, were prepared and their structures determined by X-ray crystallography. Complexes 1 and 2 form double-stranded helical chains which are supported by the N-H/O and O-H/X hydrogen bonds involving the guest water molecules and the halide anions, whereas 3 shows sinusoidal chains which are interlinked by the N-H/O hydrogen bonds and p-p interactions. Complexes 1-3 represent a unique example that the halide anions show significant effect on folding and unfolding of the Zn(II) double-stranded helical coordination polymers. Complexes 1-3 can be transformed to the corresponding complexes 4-6, which are dinuclear with 34-membered metallocycles. In these complexes, the chloride and bromide anions play the same role in the crystal structures, while the iodide anion is distinct.
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