A series of lanthanide(III) based coordination polymers have been synthesized using chelidamic acid (CA) as a ligand, [Ln(C7H2NO5 (H2O)3]. H2O (Ln = Eu, Gd, Tb, and Dy). All the compounds were prepared by solvothermal technique using H2O-DMF as solvents (4:1, volume ratio). Compounds were characterized through various instrumental techniques such as single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, IR spectroscopy, etc. In all the cases lanthanide ion adopts distorted dodecahedrongeometry. And these dodecahedrons are connected through chelidamic acid ligand to form the two-dimensional structure. These layers are H-bonded to form the three-dimensional supramolecular structure. The optical bandgap energy measurements exhibit that the variation of the band gap energy is independent of the f -electrons. This is due to the weak bonding connectivity between the metal ion and ligands, which could not perturb the density ofstates significantly. The variable-temperature magnetic measurements exhibit the paramagnetic behavior of all the compounds though the effective magnetic moments rise with increasing number of f -electrons. The present study illustrates the usefulness of the lanthanides for the structure building as well as the role of f -electrons for opto-electronic behaviors.
Volume 132, 2020
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