title: Poly[tetra-aqua-bis-(μ(3)-oxalato-κ(5)O(1),O(2):O(1'):O(1'),O(2'))(μ(2)-oxalato-κ(4)O(1),O(2):O(1'),O(2'))dipraseodymium(III)].
abstract: In the title complex, [Pr(2)(C(2)O(4))(3)(H(2)O)(4)](n), the two independent Pr(III) ions are both nine-coordinated in a distorted monocapped square-anti-prismatic geometry by seven O atoms from four oxalate ligands and two water mol-ecules. The Pr(III) ions are bridged by the oxalate ligands, forming a layer parallel to (001). O-H⋯O hydrogen bonds connect the layers.
authors.affiliation: College of Chemistry and Chemical Engineering, Pingdingshan University, Pingdingshan 467000,  People's Republic of China.
authors.forename: Cheng-Jun
authors.initials: CJ
authors.lastname: Hao
authors.forename: Hui
authors.initials: H
authors.lastname: Xie