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

The synthesis of four lanthanide coordination polymers, [Ln(Dcam)(NO 3 )(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 P 2 1 / n . The structures of the compounds are consisted a dimeric sub-building unit (SUB) of [Ln 2 (O 2 CR) 4 (NO 3 ) 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.