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The crystal structures of the copper(II) (Cu2L14B·9H2O and Cu2L14B·12H2O), nickel(II) (Ni2L14B·12H2O) and palladium(II) (Pd2L14B·12H2O) complexes of the C–C linked bis-dioxocyclam ligand have been determined by single crystal X-ray diffraction (bis-dioxocyclam, H4L14B = 6,6′-bi-(1,4,8,11-tetraazacyclotetradecane)-5,5′,7,7′-tetraone). The planar coordination environment of the metal(II) ions is formed by cis-2Namide + cis-2Namine donor atoms. Additionally, the apical site in the copper(II) complexes is occupied by the water molecule. All complex molecules adopt a “stretched” conformation with intramolecular metal–metal distances ranging from 6.608 to 7.002 A. The conformations of the macrocyclic subunits in M2L14B reveal considerable variations depending on the metal ion and differ significantly from those of the corresponding mono-macrocyclic dioxocyclam complexes ML14M (dioxocyclam, H2L14M = 1,4,8,11-tetraazacyclotetradecane-5,7-dione), thus resembling the behavior for the open-chain analogues. A detaile...

crystal growth and design

Metal-Dependent Structural Variations and the Peculiarities of Hydrogen-Bonded Networks in the Highly Hydrated Copper(II), Nickel(II), and Palladium(II) Complexes of Bis-Dioxocyclam