The crystal structure of [{m,m-bis(ZnII-cyclen)}3(μ2-CO3)2(H2O)2](ClO4)8·nH2O, m,m-bis(ZnII-cyclen) = 11,14,17,110,51,54,57,510-octaaza-1,5(1,4)-dicyclododecana-3,7(1,3)-dibenzenacyclooctaphane dizinc(II) complex, was determined by the single-crystal X-ray diffraction method at 93.15 K. The titled complex crystallized in the monoclinic space group P21/n and Z = 4 with a = 16.2677(1), b = 26.5722(2), c = 30.8348(2)Å, β = 94.2040(10)°, and V = 13293.05(16)Å3. The R1 [I > 2σ(I)] and wR2 (all data) values were 0.0682 and 0.2005, respectively, for all 24139 independent reflections. In the crystal structure, three m,m-bis(ZnII-cyclen) units are linked via two μ2-carbonate ions and form a single strand chain. Crystal water is coordinated to each end of the chain. The respective ZnII center forms a slightly distorted square pyramidal geometry. The hydrogen bond network among the cyclen rings, carbonate ions, crystal waters, and perchlorate ions connects m,m-bis(ZnII-cyclen) units.
