2026-04-17T04:06:32Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1548252025-12-04T21:40:04Zcom_2072_1057col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Maxwell Villacorta, Lindley Andrés author Amoza Dávila, Martín author Ruiz Sabín, Eliseo author 2020-04-02T09:02:49Z 2020-04-02T09:02:49Z 2018-10-25 2020-04-02T09:02:49Z A family of lanthanide metal complexes with general formula [Ln(H2O)3(18-crown-6)](ClO4)3 (Ln: TbIII, DyIII, ErIII and YbIII) has been synthesized. Their magnetic properties have been characterized by DC and AC SQUID measurements and analyzed with the help of CASSCF-type calculations. The DyIII and YbIII compounds show slow relaxation of the magnetization under an external magnetic field. The analysis of the dependence of the relaxation time with the temperature and external magnetic field reveals that the main contributions are respectively the quantum tunneling and the Raman term, respectively. The analysis of the beta electron density and electrostatic potentials indicate that the axial ligands (three water molecules) generate a relatively small repulsion with the lanthanide electron density being the reason of the moderate magnetic anisotropy found in these systems. Metalls de terres rares Imants Èters Propietats magnètiques Rare earth metals Magnets Ethers Magnetic properties Mononuclear lanthanide complexes with 18-crown-6 ether: synthesis, characterization, magnetic properties, and theoretical studies