Metal-directed assembly of two 2-D 4d-4f coordination polymers based on elliptical triple-deck cylinders hinged by meso-double helical chains

Two 2-D 4d-4f coordination polymers based on elliptical triple-deck cylinders hinged by meso-helical chains containing an isonicotinate ligand, namely, {[Ag(2)Ln(IN)(4)(H2O)(2)]center dot(NO3)center dot(H2O)}(n) (Ln = Sm and Eu, IN- = isonicotinate), have been successfully constructed through the transformation of a single-crystal to single-crystal (SC-SC) or different metal-organic polymer units, in which the recognition between the organic ligand and two types of metal ions direct the formation of the final productions.