Fluoride crystal structures. Part 31. Ammonium fluoro-oxoperoxo-(pyridine-2,6-dicarboxylato)molybdate(VI)

Abstract

The structure of the title compound has been determined by the heavy-atom method from 1 350 reflections, measured with a diffractometer, and refined by full-matrix least-squares methods to R 0.046. Crystal are orthorhombic, space group Pbca, with a= 11.15(2), b= 26.25(4), and c= 7.56(1)Å. In the structure the monomeric anions have a pentagonal-bipyramidal co-ordination, with the bidentate peroxo-group and terdentate pyridine-2,6-di-carboxylate group filling the equatorial positions, and the oxide and fluoride ligands in the axial positions. There is a very long MO–F distance (2.058 Å), which can be correlated with the trans effect of the oxide ligand (MO–O 1.661 Å).