Synthesis and physico-chemical studies of a novel layered structure with a heptanuclear Cd complex: (C9N4H28)Cd7(H2O)2Cl18·nH2O(n = 5.89)

• A new (C9N4H28)Cd7(H2O)2Cl18·nH2O(n = 5.89) an unusual cadmium chloride was synthesized.
• In the complex, five Cd(II) ions to form double chains and two Cd(II) to form tetramers.
• The coordination environment of the cadmium ions is distorted octahedral.
• The crystal packing is ensured by hydrogen bonds.
• This material was also investigated by IR and CP-MAS NMR spectroscopies.

The inorganic–organic hybrid compound (C9N4H28)Cd7(H2O)2Cl18·nH2O(n = 5.89) features an unusual cadmium chloride structure. The title complex adopts a layered structure consisting of double-chains and tetramers of [Cdϕ6] (ϕ = Cl, O) octahedra. Crystallization water molecules and [C9H28N4]4+ tetracations are located in interstices of the successive corrugated layers. This compound has also been investigated by FT-IR and solid-state 13C, 15N CP-MAS and 2D 13C-H NMR spectroscopies.