Tetrazolium N-aminides (8-10), i.e. the first derivatives of the types (A-C; Z = NY), have been prepared via the tetrazolium salts (5-7) and fully characterized. The preferred geometries of 8c-10c have been determined by a Hartree-Fock and Density Functional Theory calculation [HF/6-31G(d), B3LYP/6-31G(d)].