JOURNAL of the Tunisian Chemical Society

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Composé à nouvel polyanion hybride [(VO)2O(C204)3]2 (C5NH6)10 (NO3)4.4,44H2O

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A novel organic–inorganic hybrid vanadium [(VO)2O(C2O4)3]2(C5NH6)10(NO3)4.4,44H2O was synthesized at room temperature and characterized by IR spectrum and electron microscopy. Its crystal and molecular structure was determined by single crystal X-ray diffraction. This compound crystallizes in the triclinic system, space group Pī , with a = 10,645(3) Å, b = 14,373(2) Å, c = 15,370(3) Å , α = 110,08(1), β = 99,65(2), γ = 102,86(2)° and Z=1. The structure was solved and refined to R = 0.037, Rw = 0.077. The crystal structure is characterized by the cyclic and centrosymetric [(VO)2O(C2O4)3]26- anion. It consists of two binuclear mixed valence vanadium (IV) - vanadium (V) complexes [(VO)2O(C2O4)4] bridged by bis(bidentate oxalate) ligands. In this compound, each V atom is in a distorted octahedral coordination, being bonded to one terminal oxo-O atom, one bridging O atom, two O atoms from an oxalato ligand and two from an other oxalato bridging ligand. The structure cohesion is ensured by hydrogen-bonding and Vander Walls interactions, which form a three-dimensional framework.

R. Ksiksi, M. Graia, A. Driss

complex, vanadium, structure, IR absorption

Pages 143-156

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