[1,5-Bis(1-methyl-1H-imidazol-2-yl-methyl-kappa N-3)-1,5-diazacyclooctane-N,N ' ]chlorocobalt(II) perchlorate

The crystal structure of the title compound, [CoCl(C16H26N6)]ClO4, consists of discrete [CoCl(C16H26N6)](+) cations and perchlorate anions. The five-c oordinate Co-II atom has four nitrogen donors from the new mesocyclic ligan d 1,5-bis(1-methyl-1H-imidazol-2-ylmethyl)-1,5-diazacyclooctane [Co-N 2.046 (3)-2.214 (4) Angstrom], and a chloride anion at the apical site [Co-Cl 2. 3184 (13) Angstrom]. The coordination geometry of the complex is essentiall y square pyramidal. The mesocyclic ligand takes a boat-chair configuration and the two imidazole pendants are not coplanar. The dihedral angle between the two imidazole planes is 15.97 degrees. An H atom from the 1,5-diazacyc looctane group effectively blocks the axial coordination site opposite the Cl ligand.