title: Dichloridobis[2-(2-chloro-ethyl)-1,2,3,4-tetra-hydro-pyrazino[1,2-a]benzimidazole-κN]cobalt(II).
abstract: In the title compound, [CoCl(2)(C(12)H(14)ClN(3))(2)], the central Co(II) ion lies on a twofold rotation axis and adopts a distorted tetra-hedral coordination geometry defined by two N atoms from two 2-(2-chloro-ethyl)-1,2,3,4-tetra-hydro-pyrazino[1,2-a]benzimidazole ligands and two chloride anions. The Cl atom located in the side chain of the ligand is involved in inter-molecular C-H⋯Cl hydrogen bonding, which links neutral complex units into a one-dimensional right-handed helical chain running along a crystallographic 4(1) axis. Such hydrogen-bonded helical chains are connected to each other to form a homochiral three-dimensional supra-molecular network. One C atom of the 2-chloro-ethyl chain is disordered over two positions, with site-occupancy factors of 0.52 and 0.48.
authors.affiliation: Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yao
authors.initials: Y
authors.lastname: Zhao
authors.forename: Zhi-Rong
authors.initials: ZR
authors.lastname: Geng
authors.forename: Zhi-Lin
authors.initials: ZL
authors.lastname: Wang