Synthesis, Characterization and Structure of Bis‐ and Tetrakis‐Aziridine‐Nickel( II ) and Copper( II ) Complexes

The synthesis and characterization of mononuclear tetrakis‐aziridine nickel( II ) and copper( II ) complexes as well as of a dinuclear bis‐aziridine copper( II ) complex are described. The reactions of anhydrous MCl 2 (M = Ni II , Cu II ) with aziridine (= az = C 2 H 4 NH, C 2 H 3 MeNH, CH 2 CMe 2 NH) in CH 2 Cl 2 at room temperature in a 1:5 and 1:2 molar ratio, respectively, afforded the tetrakis‐aziridine complexes [M(az) 4 Cl 2 ] (M = Ni, Cu) or the dimeric bis‐aziridine complex [Cu(az) 2 Cl 2 ] 2 . After purification, all of the complexes were fully characterized. The single crystal structure analysis revealed two different coordination modes. Whereas both nickel( II ) complexes can be classified as showing an elongated octahedral structure, copper( II ) complexes show either an elongated octahedral or a square pyramidal arrangement forming dimers with chlorido bridges in axial positions. Furthermore, the results of magnetic measurements of the nickel( II ) and copper( II ) compounds are presented.