A novel organic–inorganic hybrid 3D framework based on neodymium oxalate–selenites [Nd2(SeO3)2(C2O4)(H2O)2]·2H2O

A novel organic–inorganic hybrid 3D framework based on neodymium oxalate–selenites [Nd2(SeO3)2(C2O4) (H2O)2]·2H2O (1) has been successfully synthesized under hydrothermal conditions and further characterized by elemental analyses, inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray powder diffraction (XRPD), IR spectrum, thermal analysis, and X-ray single-crystal diffraction. X-ray structural analysis reveals that 1 features a square ring composed of two {Nd2O4C2} subunits bridged by two {SeO3}2− anions via the corner-sharing mode. Interesting, the rhombic {Nd2O2} units interconnected with each other generating the 1D zigzag chain structure, whereas adjacent 1D chains are bridged by {SeO3}2− groups forming the 2D network architecture, which are further linked together through oxalate ligands leading to the 3D framework. The magnetic behavior of 1 is mainly due to the splitting of the 10-fold degenerate 4I9/2 ground state affected by the crystal field perturbation and the progressive depopulation of the higher energy state upon cooling.