A novel praseodymium coordination polymer with Pcu topology: Crystal structure, thermal decomposition, luminescence and magnetic properties

A unique lanthanide coordination polymer, formulated as {[Pr 3 (Heimda) 2 ( μ 2 -HCOO) ( μ 2 -C 2 O 4 ) 2 ·5H 2 O]} n (H 3 eimda = 2-ethyl-1H‐imidazole‐4,5‐dicarboxylic acid, H 2 C 2 O 4 = oxalic acid) ( 1 ), has been hydrothermally synthesized by using lanthanide(III) nitrate, H 3 eimda acid at the presence of two kinds of carboxylate as coligands. The polymer was characterized by elements analysis, IR spectroscopy, thermogravimetry, variable-temperature magnetic susceptibility and single‐crystal X-ray diffraction study. Polymer 1 possesses three-dimensional (3-D) framework with Pcu topology, containing the original 1D zig-zag chain composed of [Pr-HCOO] 2+ moieties. Variable temperature magnetic susceptibility measurements indicate that depopulation of the Stark levels or possible antiferromagnetic interactions within polymer 1 leads to the continuous decrease of χ M T when the samples are cooled from 300 to 2 K, and the photoluminescence properties of polymer 1 were also investigated.