Polyoxomolybdate; Keggin; Hybrid inorganic-organic; Crystal structure; Hydrogen bonding; Cyclic voltammetry

Document Type : Research Article


Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, I.R. IRAN


The assembly of phosphomolybdic acid of Keggin-type polyoxoanion, [(PO4)Mo12O36]3-, and [La(DMF)8]3+ fragments via layer method under mild condition led to the formation of a new hybrid inorganic-organic compound with formula [La(DMF)8][(PO4)Mo12O36] (1) (DMF = N,N- dimethylformamide). The hybrid is characterized by using elemental analysis, IR spectroscopy, Energy Dispersive X-ray Spectroscopy analysis (EDS), cyclic voltammetry, and single crystal X-ray diffraction. This compound crystallizes in the orthorhombic system, space group Pna21 with four molecules per unit cell. The unit cell parameters are: a = 27.1550 (5) Å,b =18.5111 (4) Å, c = 13.5055 (3) Å, and α = β= γ =90̊. The final R value was 0.0424 for 65109 observed reflections. The crystal structure is stabilized by non-covalent interactions of type C─H···O, linking the various components into a three-dimensional framework, which results in the formation of a supramolecular structure. Redox activities for the molybdenum centers of 1 have been observed using cyclic voltammetry.


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