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The cluster compounds (NH 4 ) 4 [Nb 6 Cl 12 (N 3 ) 6 ](H 2 O) 2  (1) and Na 1.15(3) La 0.85(3) [Nb 6 Cl 12 (N 3 ) 6 ]- (H 2 O) 13(1)  (2) have been synthesized by the reaction of an aqueous solution of Nb 6 Cl 14  with an excess of NaN 3  and the respective chloride salts. 1 crystallizes isotypically to the other alkali metal cluster azides in the space group P1̄̄ (no. 2) with the lattice parameters a = 908.97(8), b = 932.78(8), c = 1045.78(9) pm; and α = 95.94(1), β = 101.68(1) and γ = 102.41(1)°, while 2 is found to be nearly isostructural to the alkaline earth metal cluster azides crystallizing in the space group Fd3̄m (no. 227) with the lattice parameter a = 1996.9(1) pm. The stoichiometry of 2 was confirmed by EDX analyses which also led to a reconsideration of the water content of alkaline earth metal cluster azide compounds. The title compounds and results obtained from the reevaluation of the alkaline earth metal cluster azides are compared.

zeitschrift für naturforschung b

The New Niobium Cluster Azides (NH 4 ) 4 [Nb 6 Cl 12 (N 3 ) 6 ](H 2 O) 2  and Na 1.15(3) La 0.85(3) [Nb 6 Cl 12 (N 3 ) 6 ](H 2 O) 13(1).  Syntheses and Crystal Structure Determination