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Structure of 1. H atoms and free water molecules in the framework are omitted for clarity. (a) Double helical [Cu2(mal)2(H2O)]n chains in 1 and 2. (b) Projection of the 3D framework of 1 at the ab plane. Crosslinking bpy ligands penetrating the double-helical chain viewed at ab (c) and ac (d) plane.
