Research Article: meso-[5,5,7,12,12,14-Hexamethyl-1,4,8,11-tetra­azacyclo­tetra­deca-1(14),7-diene]nickel(II) dibromide dihydrate

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.

Partial Text

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 ▶).




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