Alternating Current and Direct Current Magnetic Susceptibility Study on a Novel Polydentate Schiff Base (Salen Ligands)–Cerium(III) Complex: Synthesis, Characterization, Thermal, and DFT Studies

A novel cationic complexes, [Cu4Ce2·(H2L)4(NO3)4(H2O)3](NO3)2·5H2O·2MeOH was synthesized, characterized, and studied using XRD, TG/DTG/DSC techniques, as well as measurement of both AC & DC magnetic susceptibility. Analyzing of the results exhibited that this complex crystallize as (NO3)-bridged structures, whereas Cerium ion of lanthanide(III) family acts as a linkage connecting two [CuH2L] coordination subunits. In each hetero-tri-nuclear section, asymmetry structure was created in the degree of planarity of the bridging CuO2Ln segments. In contrast of Cu(II) ions, which are mostly six-coordinate with octahedral geometry and occasionally are five with distorted square pyramidal, Ln(III) ions including Ce(III) are nine-coordinate. In addition, through AC and DC magnetic susceptibility it was confirmed temperature dependence of the magnetic susceptibility for these complexes. Finally, the field-dependent magnetization of the ferromagnetic interaction between centers Cu(II) and Ce(III) was discussed through both experimental and DFT calculation.