The Cluster Polyazide Complexes: Synthesis, Crystal Structures, and 14N NMR Studies of [{Re3(μ-X)3}(N3)9]3- (X = Br or I)

Azide cluster complexes [{Re-3(mu-Br)(3)}(N-3)(9)](3-) and [{Re-3(mu-I)(3)}(N-3)(9)](3-) were obtained by reaction of Re3X9 (X = Br or I, respectively) with sodium azide in methanol. The complexes were crystallized as cesium salts of the compositions Cs-3[{Re-3(mBr)(3)}(N-3)(9)]center dot H2O (1) and Cs-3[{Re-3(m-I)(3)}(N-3)(9)]center dot H2O (2) and characterized by X-ray single-crystal diffraction and elemental analyses, mass spectrometry, N-14 NMR spectroscopy, and DFT calculations. In the anions, each rhenium atom is coordinated by three azide ligands. To the best of our knowledge, these compounds represent the first case of metal cluster polyazide complexes (i.e., where each metal atom bears more than one azide ligand). Both complexes are stable in air but are very shock sensitive, and spontaneous explosive decomposition is also possible.

Automated summary

Azide cluster complexes were obtained by reacting Re3X9 with sodium azide. These complexes represent the first case of metal cluster polyazide complexes and exhibit high explosiveness.