A novel three dimensional organic-inorganic hybrid based porous phase:: Synthesis and characterization of reduced oxovanadium pyromellitate, [VIV2O2(H2O)2(C6H2(COO)4)]

The hydrothermal reaction of a mixture of VOSO4 center dot H2O, 1,2,4,5-benzenetetracarboxylic acid (pyromellitic acid) and 0.1 M H2SO4 for 72 h at 160 degrees C gives blue needle like crystals of [V-IV stop O-2(2)(H2O)(2)(C6H2(COO)(4))] in 30% yield. The compound has a porous 3-D extended network structure having a rigid architecture which is held together by the multidentate functionalities of 1,2,4,5-benzenetetracarboxylate ligand. Crystal data for the compound: monoclinic space group C 2/c (No:15), a = 11.756(5) angstrom, b = 9.645(3) angstrom, c = 11.822(7) angstrom, beta = 107.10(4)angstrom, Z = 8. The compound constitutes the first example of a fully reduced oxovanadium based solid incorporating the organic ligand. This article consists of synthesis, crystal structure and characterization of [(V2O2)-O-IV(H2O)(2)(C6H2(COO)(4))].