Crystal structure of bis­[trans-(1,4,8,11-tetra­aza­cyclo­tetra­decane-κ(4) N)bis­(thio­cyanato-κN)chromium(III)] tetra­chlorido­zincate from synchrotron data

The structure of the title compound, [Cr(NCS)(2)(cyclam)](2)[ZnCl(4)] (cyclam = 1,4,8,11-tetra­aza­cyclo­tetra­decane, C(10)H(24)N(4)), has been determined from synchrotron data. The asymmetric unit contains two independent halves of the Cr(III) complex cations and half of a tetra­chlorido­zincate anion. In each complex cation, the Cr(III) atom is coordinated by the four N atoms of the cyclam ligand in the equatorial plane and by two N-bound NCS(−) anions in a trans axial arrangement, displaying a distorted octa­hedral geometry with crystallographic inversion symmetry. The mean Cr—N(cyclam) and Cr—N(NCS) bond lengths are 2.065 (4) and 1.995 (6) Å, respectively. The macrocyclic cyclam moieties adopt centrosymmetric trans-III configurations with six- and five-membered chelate rings in chair and gauche configurations, respectively. The [ZnCl(4)](2−) anion, which lies about a twofold rotation axis, has a slightly distorted tetra­hedral geometry. The crystal packing is stabilized by hydrogen-bonding inter­actions between the N—H groups of the cyclam ligands, the S atoms of the NCS(−) groups and the Cl(−) ligands of the anion.