Ethylenediaminium niobium oxyfluoride

The title compound, bis(ethylenediaminium) μ‐oxo‐bis[tetrafluorooxoniobium(V)], (C 2 H 10 N 2 ) 2 [Nb 2 O 3 F 8 ], is a novel organically templated niobium oxyfluoride. It consists of isolated [Nb 2 O 3 F 8 ] 4− octahedral dimers charge balanced by ethylenediaminium cations, two of which lie about inversion centres. Two NbO 2 F 4 octahedra are fused through a common O atom to form the dimers. Characteristic short terminal Nb=O bond lengths and longer Nb—F and bridging Nb—O bond lengths are observed, which result in the out‐of‐centre distortion of the octahedra, a manifestation of the second‐order Jahn–Teller effect. Extensive hydrogen bonding between the dimers and the organic template is exhibited.