Fluoride crystal structures. Part 33. Tetraethylammonium µ-fluoro-bis[oxoperoxo(pyridine-2,6-dicarboxylato)molybdate(VI)]

Abstract

The structure of the title compound has been determined by the heavy-atom method from 2 417 reflections, measured with a diffractometer, and refined by full-matrix least-squares methods to R.0.044. Crystals are monoclinic, space group C2/c, with unit cell dimensions a= 18.55(2), b= 12.43(2), c= 14.17(2)Å, and β= 119.1(3)°. In the structure each molybdenum atom has a pentagonal-bipyramidal co-ordination, with the centrosymmetric binuclear anions formed by axially linking two units, through a symmetric fluorine bridge. The Mo–F distance of 2.135 Å is very long, due to the trans effect of the oxide ligand (Mo–O 1.659 Å) and to the bridging role of the fluorine atom.