The crystal structures ofα,ω-diaminoalkane-cadmium(II) tetracyanonickelate(II) — Aromatic molecule inclusion compounds. VII: Three-dimensional host structures built ofcatena-[cadmium(II) tetra-μ-cyanonickelate(II)] layers and 1,3-diaminopropane, 1,5-diaminopentane or 1,7-diaminoheptane pillar |