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Ideal S2 symmetry is shown by the [Ge(N3)6]2− ion (1) in the crystal lattice of the [N(PPh3)2] salt, whereas density functional calculations predict an S6‐symmetric minimum structure for 1. Short interionic Na−N contacts lead to a reduction of the symmetry of the anion to C1 in crystalline [Na2(thf)3(Et2O)][Ge(N3)6], the product of the reaction of GeCl4 with NaN3. With Lewis bases, 1 reacts to give derivatives of the long sought after tetraazide Ge(N3)4 (2; L$\hskip -0.4 em\vskip -0.68em\frown\hskip -0.4 em$L=2,2′‐bipyridine, 1,10‐phenanthroline).

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Highly energetic and still stable: The first base adducts of silicon tetraazide, Si(N3)4(L2) (L2=bipyridine, 1,10‐phenanthroline), were prepared and fully characterized (picture: the ball and stick model of the adduct with L2=2,2'‐bipyridine in front of its FTIR spectrum; dark gray C, white H, light gray Si, blue N). The highly energetic compounds combine a remarkable thermal stability, with a high reactive nitrogen content (up to 48 %) and convenient accessibility.

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