A Nanotubular 3D Coordination Polymer Based on a 3d–4f Heterometallic Assembly

Large pores comprising 48-membered rings characterize the isostructural lanthanide–transition-metal coordination polymers [{[Ln(dipic)3Mn1.5(H2O)3]⋅n H2O}∞], H2dipic=pyridine-2,6-dicarboxylic acid; Ln=Pr, n=2 (shown here); Ln=Gd, n=3.5; Ln=Er, n=3. Many water molecules are trapped in the nanotubular structure, and the framework remains intact on removal of the uncoordinated water molecules.