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

A new organic–inorganic hybrid compound based on Anderson-B polyoxomolybdates, (H2Pz)5[Al(OH)6Mo6O18]2(SO4)2 · 16H2O (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.