| Molecular-based magnetic materials have a broad application prospects in the fields of ultrahigh-density information storage and quantum computing.Currently,they are becoming one of the most appealing prospects among the functional materials,and have received extensive attention from scholars from all over the world.This dissertation focuses on the cutting-edge field of molecular nano-magnetic materials.Using the highly anisotropic rare earth ion Dy ion as the spin carrier,a series of novel rare earth complexes have been designed and synthesized,and their structure and magnetic properties have been characterized.A systematic study was carried out to reveal the influence of the coordination environment on the magnetic properties followed by exploring the feasibility of introducing optical switch properties into the system.Firstly,A series of dinuclear DyIII complexes[Dy2(L1)2(?2-anthc)2(anthc)4]·2H2O(1),[Dy2(L2)2(?2-anthc)2(anthc)4](2),[Dy2(L3)2(?2-anthc)2(anthc)4](3)and[Dy2(L4)2(?2-anthc)2(anthc)4]·4H2O(4)have been designed and synthesized using 9-anthracenecarboxylic acid ligands,in order to carry out a systematic investigation from the crystal structure and magnetic properties point of view.These complexes all belong to the nine-coordination configuration,however due to the existence of the DyIII ions are in different coordination environments,the magnetic properties of the four complexes are quite different.Complex 1 and complex 2exhibit single molecules magnet behavior under zero field,while complex 3 and complex 4 do not exhibit dynamic magnetic properties where in particular,an antiferromagnetic interaction has been observed in complex 4.Secondly,based on the triangular Dy3 system,a Dy3 complex[Dy3L3(?3-OH)2(H2O)3Cl2]·2Cl with 9-anthracenecarboxylic acid ligand was synthesized.Although theoretically,photoisomerization could be occurred under 365nm light irradiation,after irradiating the crystal with 365 nm wavelength light several times,it was found that the structure did not change.By analyzing the crystal structure,it was found that the 9-anthracenecarboxylic acid at the tail was severely distorted due to the spatial position effect.Magnetic measurement result show that the Dy3 crystal is consistent with previous reports.Therefore,incorporating the9-anthracenecarboxylic acid ligand during the synthesis of the Dy3 complex could be a good optical switch building module,and could endow in synthesizing complex with optical switch properties in the future. |
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