Lanthanide coordination polymers based on Ln2 cluster: Syntheses, crystal structures photoluminescence and magnetic properties

The synthesis of four lanthanide coordination polymers, [Ln(Dcam)(NO3)(MeOH)(2)](n) (Ln = Pr.1, Nd.2, Sm.3, and Eu.4: D-H(2)cam = (+)D-camphoric acid) under solvothermal conditions is reported. Single-crystal X-ray diffraction analyses revealed that the compounds Pr.1-Eu.4 are isostructural and crystallize in the monoclinic space group P2(1)/n. The structures of the compounds are consisted a dimeric sub-building unit (SUB) of [Ln(2)(O2CR)(4)(NO3)(2)(MeOH)(4)], which is covalently-linked by cam(2-) to a 2D grid layer and the layer is extended into a 3D supramolecular network by hydrogen bonding. The room temperature-photophysical properties of compounds Eu.4 were investigated and the direct current (dc) magnetic susceptibility of compounds Pr.1-Eu.4 were collected. The findings indicate that compounds Pr.1-Eu.4 are capable of both antiferromagnetic and spin-orbital interactions. (C) 2013 Elsevier Ltd. All rights reserved.