Synthesis, structure and analysis of intermolecular interactions of organic–inorganic hybrid compound based on Anderson-type polyoxometalates and piperazine

Abstract A new organic–inorganic hybrid compound based on Anderson-B polyoxomolybdates, (H 2 Pz) 5 [Al(OH) 6 Mo 6 O 18 ] 2 (SO 4 ) 2  · 16H 2 O ( 1 ) (Pz = piperazine) was synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. The anions in 1 are stacked into a layer in [2 0 0] plane by hydrogen bonds of water molecules and van der Waas force, and between the layers are the sulfate ions and piperazine ions. The hydroxyl hydrogen atoms of Anderson-B anion make the anion be hydrogen bond donor. And the sulfate anion is the hydrogen bond acceptor. The analysis of the Hirshfeld surfaces of 1 makes us understand the type and nature of intermolecular interactions in the crystal in a visual manner.