Date Published: June 01, 2010
Publisher: International Union of Crystallography
Author(s): Feifei Shi, Xiaodan Chen, Rong Rong, Qianqian Bao.
The asymmetric unit of the title complex, [Ni(C16H32N4)]Br2·2H2O, contains two [Ni(C16H32N4)]2+ cations, four Br− anions and four uncoordinated H2O molecules. The Ni atoms are in a slightly distorted square-planar coordination by the four macrocyclic N atoms, which are almost coplanar [N—N—N—N torsion angles of 2.97 (6) and 3.12 (7)°]. In the crystal, a network of N—H⋯Br, O—H⋯Br and N—H⋯O hydrogen bonds leads to the formation of a chain structure.
The nickel (II) tetraazamacrocyclic complex cation, [Ni(C16H32N4)]2+, has both meso and enantiomeric forms, see: Warner et al. (1968 ▶). For the structures of related macrocyclic complexes, see: Whimp et al. (1970 ▶). For Ni—N(amine) and Ni—N(imine) bond distances, see: Szalda et al. (1991 ▶).