A new proton-conducting material (C6H14N2)-[NiV2O6H8(P2O7)(2)]center dot 2H(2)O (1) was hydrothermally synthesized by using 1,4-diazabicyclo[2,2,2]octane (DABCO) as the template. Its inorganic framework, determined by single crystal X-ray diffraction, is constructed by the connection of V/NiO6 octahedral to P2O7 pyrophosphate units through sharing oxygen atoms, giving rise to three-dimensional (3D) intersecting 6-, 8-, and 12-ring channels along the [100], [010], and [001] directions, respectively, in which there are ordered protonated DABCO cations balancing negative charge of the framework and disordered water molecules. Complex impedance measurements on polycrystalline samples gave proton conductivities of 4.9 x 10(-3) and 2.0 x 10(-2) S cm(-1) at 25 and 60 degrees C under high humidity conditions, respectively. The activation energy is 0.38 eV.