The Synthesis, Structure And Magnetic Property Studies Of Dysprosium Compounds

In recent years, molecular magnets have become one of the new interdisciplinary research field of physical, chemical, material, life science,electronic information science and so on. And molecular magnetism to explore the magnetic properties presented by molecules or molecular aggregates with unpaired electrons attracts more and more attention. In this paper, in the light of the basic principles of molecular engineering and magnetic crystal engineering, we designed and synthesized 12 unreported magnetic Dy(III) complexes based on carboxylic acids as bridging ligands, N-donor ligands as terminal ligands and dysprosium salts by hydrothermal or solvothermal method. Furthermore, the structure and magnetic properties of all complexes were studied. The detailed contents are as follows:(1)We successfully synthesized two dinuclear dysprosium complexes by using benzoic acid,2-methylbenzoic acid as bridging ligands. Furthermore, those complexes were analyzed crystal structure and characterized magnetic properties. The analysis shows that complexes 1 and 2 show single ion magnetic properties.(2)A dozen dysprosium complexes were obtained by using 3-nitrobenzoato, 2-methylbenzoic acid, 4-chlorobenzoic acid, 2-naphthoic acid, 4-nitrobenzoato as linking ligands, and 1,10-phenanthroline as terminal ligand, including eight 4f compounds and two 3d-4f compounds. Wherein, complexes 6 and 7, 8 and 9 have phenomenon of 0Dâ†'0D single-crystal-to-single-crystal transformation(SCSC). Moreover, Structural features and magnetic properties were studied. The magnetic properties exhibit that complexes 3-10 show single molecular magnetic properties. In the interim, complex 10 has a high energy barrier(66.3K) at zero static magnetic field.(3)Based on N-, O-donor ligand system(4-chlorobenzoic acid, 2,2’-bipyridine), and at diverse temperatures, two dinuclear dysprosium complexes were prepared. Additionally, structural features and magnetic properties were discussed. The results show that complexes 11 and 12 display single molecular magnetic properties. Meanwhile, the effective energy barrier of compound 11 is 42.6K at DC = 1000 Oc, and in compound 12, its effective energy barrier is 41.3K at DC = 2000 Oc.