• Comparative Studies on Optical and Electronic Behavior of Lanthanide-based Coordination Polymers: Synthesis, Structure, Absorption-Emission and Magnetic Properties

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    • Keywords

       

      Coordination polymers; lanthanides; crystal structure; band-gap variation; magnetization.

    • Abstract

       

      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.

    • Author Affiliations

       

      PRABU MANI1 K M RANJITH2 SUKHENDU MANDAL1 AVIJIT KUMAR PAUL3

      1. School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, 695 016, Kerala, India
      2. School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram, 695 016, Kerala, India
      3. Department of Chemistry, National Institute of Technology, Kurukshetra, 136 119, Haryana, India
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