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Ba 16 NbsN 19  was synthesized by reaction of Ba with Nb under nitrogen at ambient pressure at 1223 K. The refined crystal structure was solved in the space group P1̄ (no. 2), Z = 2, with the lattice constants a = 1099.33(3), b = 1140.41(15), c = 1622.06(6) pm, α = 72.197(2)°, β = 59.949(1)°, γ = 82.243(2)° and R 1  = 0.058, wR 2  = 0.088. The crystal structure contains both isolated [NbN 4 ] 7-  as well as dimeric units [Nb 2 N 7  ] 11-  . Together with the Ba 2+  ions the compound has to be regarded as Ba 16  [NbN 4 ] 3 [Nb 2 N 7  ].

Ba 16 Nb 5 N 19 - A Nitridoniobate(V) Containing Isolated [NbN 4 ] 7- and [Nb 2 N 7 ] 11- Units