Crystal Structure and Physicochemical Properties of Two Supramolecular Compounds: (C4H8NH2)4[Mo8O26] and (NH4)Na2[AsIIIMo6O21(O2CCH2NH3)3]•8H2O

Two inorganic-organic hybrid supramolecular compounds based on polyoxometalates formulated as (C4H8NH2)(4)[Mo8O26] (1) and (NH4)Na-2[(AsMo6O21)-Mo-III(O2CCH2NH3)(3)]center dot 8H(2)O (2) have been synthesized by conventional solution method and characterized by infrared, UV-Vis and single-crystal X-ray diffraction analyses. Thermal analysis was performed to study their thermal stability. The atomic arrangement in compound (1) can be described as inorganic layers built by [Mo8O26](4-), pyrrolidinium cations are embedded into layers. The fascinating structural feature of compound (2) is that the glycine molecules are bounded to two edge-sharing Mo centers via their carboxylate functionality leading to functionalized heteropolymolybdate [(AsMo6O21)-Mo-III(O2CCH2NH3)(3)](3-), extensive net hydrogen bonds between cations and anions contribute to the crystal packing. The electrochemical behavior of compound (2) has been studied.