Crystal structure of di­aqua­(3,14-diethyl-2,6,13,17-tetra­aza­tri­cyclo­[16.4.0.0(7,12)]docosa­ne)copper(II) dichloride tetra­hydrate

The crystal structure of the novel hydrated Cu(II) salt, [Cu(L)(H(2)O)(2)]Cl(2)·4H(2)O (L = 3,14-diethyl-2,6,13,17-tetra­aza­tri­cyclo­[16.4.0.0(7,12)]docosane, C(22)H(44)N(4)) has been determined using synchrotron radiation. The asymmetric unit contains one half of the [Cu(L)(H(2)O)(2)](2+) cation (completed by crystallographic inversion symmetry), one chloride anion and two lattice water mol­ecules. The copper(II) atom exists in a tetra­gonally distorted octa­hedral environment with the four N atoms of the macrocyclic ligand in equatorial and two O atoms from water mol­ecules in axial positions. The latter exhibit a long axial Cu—O bond length of 2.7866 (16) Å due to the Jahn–Teller distortion. The macrocyclic ring adopts a stable trans-III conformation with typical Cu—N bond lengths of 2.0240 (11) and 2.0441 (3) Å. The complex is stabilized by hydrogen bonds formed between the O atoms of coordinated water mol­ecules and the NH groups as donors, and chloride anions as acceptors. The chloride anions are further connected to the lattice water solvent molecules through O—H⋯Cl hydrogen bonds, giving rise to a three-dimensional network structure.