An Oxalate Bridged Praseodymium-Organic Framework Containing 2- (Pyridin-4-yl)-1H-4,5-Imidazole- Dicarboxylate: Crystal Structure, Luminescence, and Magnetic Property

Abstract

A novel lanthanide–organic coordination polymer incorporating both nitrogen hetrocyclic dicarboxylate and oxalate coligand, namely {[Pr₂(Hpimda)₂(μ₄-C₂O₄)·2H₂O]·2H₂O}_n, (H₃pimda = 2-(Pyridin-4-yl)-1H-4,5-imidazole-dicarboxylic acid), has been fabricated successfully and characterized systematically. The polymer features 3D framework structure consisting of oxalate pillared praseodymium -Hpimda^2– layers with intersected channels, occupied by coordinated and lattice waters, among which the 1D zig-zag chains are constructed from binuclear (Pr-Hpimda)₂ units bridged by oxalate, acting as the secondary building unit. The polymer exhibits strong photoluminescence in visible region under ultraviolet excitation using 305 nm radiations in the solid state. The bulk purity analysis and variable-temperature magnetic susceptibility of polymer 1 were also studied.

Keywords:

• luminescence property
• magnetic property
• oxalate bridging
• praseodymium (III) polymer

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 21271098, 21071074, and 21273101), and Program for Backbone Teachers in Universities of Henan university (No. 2012GGJS-158).