Novel examples of hybrid organic-inorganic solids based on V4O124- building blocks

Abstract

New hybrid organic/inorganic copper oxovanadium compounds of composition [Cu(dpa)(2)](4)V4O12 (1), Cu-2(bipy)(2)V4O12 (2), and Cu-2(bipy)(2)V6O17 (3), which crystallize in the monoclinic 1, 2 and triclinic 3 symmetry, respectively, were obtained by soft hydrothermal routes. The first two structures present isolated [V4O12](4-) anionic units, the structure of 3 exhibits the same [V4O12](4-) cycles coupled by V2O5 dimeric bridges propagated as an infinite chain along the c-direction 3. For compound 1, the copper(I) centers are bonded to four nitrogen atoms with a distorted tetrahedral geometry. For compounds 2 and 3, the copper(II) centers are square pyramidal with two nitrogen atoms from the neutral diimine ligand and three oxygen atoms from the oxovanadium sub-unit. In all the compounds described herein, the vanadium ions are as V(V), occupying solely tetrahedral sites.