5,6-Dihydro-1,10-phenanthroline-1,10-diium μ-oxido-bis­[penta­fluoridotantalate(V)]

In the title compound, (C₁₂H₁₂N₂)[Ta₂F₁₀O], the doubly protonated 5,6-dihydro-1,10-phenantroline-1,10-diium cation is located on a twofold rotation axis, whereas the isolated [Ta₂OF₁₀]²⁻ dianion has -1 symmetry. In the so far unknown dianion, the symmetry-related Ta^V atoms are octa­hedrally coordinated by five F atoms and a bridging O atom, the latter being located on an inversion centre. The two pyridine rings in the cation make a dihedral angle of 22.8 (4)°. The cations and dianions are arranged in layers parallel to (100) and are connected through N—H...F and C—H...F hydrogen-bonding inter­actions into a three-dimensional structure.