Hydrothermal synthesis and crystal structures of two lanthanide coordination polymers with novel tetradentate-coordinated perchlorates

Two new lanthanide coordination polymers {[Ln(C2O4)(ClO4)(H2O)] · Cl}n [Ln = Pr (1), Nd (2)] have been hydrothermally synthesized and characterized. X-ray crystal structure analyses reveal that compounds 1 and 2 are isostructural and that oxalate and perchlorate ligands bridge lanthanide ions into 3D framework with highly ordered 1D channels, in which uncoordinated Cl anions are located as counterions.