Structural, physico-chemical properties of a hybrid material based on Anderson-type polyoxomolybdates

A new organic–inorganic hybrid compound based on a rare β-isomer of Anderson polyoxomolybdates cluster with mixed cations, ammonium and hexamethylenetetramine has been synthesized by the slow-evaporation method. The hybrid material was characterized by single crystal X-ray diffraction, infrared spectroscopy, UV-Visible spectroscopy and thermogravimetric analysis. Hirshfeld surface analysis helps to investigate all the intermolecular interactions within the structure. (C6H14N4)2(NH4)2[β-HSbMo6O24]·8H2O crystallizes in an orthorhombic system and Pnma space group, with a = 23.6649(6) Å, b = 19.5394(5) Å, c = 8.6683(2) Å, α = β = γ = 90 (°) and Z = 4. The structure is deposited in the Cambridge Crystallographic Data Center (CCDC) (deposition number CCDC 2184536). The new hybrid organic–inorganic polyoxometalates based material three-dimensional structure is shaped by the connection of the structure components with N–H···N, N–H···O, N–H···Ow, Ow–H···O hydrogen bonds types and their interactions. The infrared spectrum fully confirms the X-ray crystal structure. The UV-Vis spectrum shows two absorption bands with an optical energy gap of 4 eV, consequently the hybrid material is classified as an insulator. Thermogravimetric and differential thermal analysis was used to study thermal stability of the hybrid organic–inorganic compounds. Hirshfeld surface fingerprint graphics showed several types of intermolecular interactions, where hydrogen bonds are the majority.