Supramolecular assemblies involving metal-organic ring interactions: heterometallic Cu(II)-Ln(III) two-dimensional coordination polymers

Three isostructural two-dimensional coordination polymers of the general formula [Ln(2)(CuL)(3)(H2O)(9)]center dot 5.5H(2)O, where Ln = La (1), Nd (2), and Gd (3), have been synthesized and isolated from aqueous solutions and their single-crystal structures determined by X-ray diffraction. The supramolecular interaction between the non-aromatic metallorings plays an important role in stabilizing the structure of these compounds. The thermal stability, reversible solvent uptake, electronic properties and magnetic studies of these compounds are also reported.