Syntheses And Magnetic Properties Of 3d Metal Compounds

Molecular materials have been attracted great attentions for a new type of materials, and great progess have been made under the effort of chemist and physicist in recent 10 years. Molecular magnet have its special properties and advantages, such as miniaturization, low power, high speed response, compatibility of biology junction. All of these characteristics determine that there are great potential applications in the aspects of magnetical storage materials, nano-machine and the guide of magnetical medicines. It is very important to synthesize new molecular magnet which have fantastic magnetic property. So all of our work was focused on the synthesis of new molecular magnet which could be used in the application of molecular units.(1) Used azido as the bridged ligand, acted with different terminla ligand and Mn( II), Co( II) ions under rational synthesi routes. After tried lots of synthesis routes, some new molecular magnet have been obtained. Azido as bridged ligands in these compounds were coordinated in the mode of EO(μ1,1-N₃) which connected the Mn(II), Co(II) ions. Through the magnetic measurement, it could be found that ferromagneti coupling were existed in 1 and 3 which were in accordance with the experiential rule: ferromagnetic coupling were existed in compounds in which azido wes coordinated as EO mode. And in 2, antiferromagnetic coupling were exhibited, which was in accordance with the experiential rule.(2) Used different terminal ligands, reacted with Mn( II), Ni( II) and irons ions under rational synthesi routes, some new cluster compounds were obtained. Through the magnetic measurement, strong antiferromagnetic coupling was exihibited between different valence iron ions. More higher poly-clusters which have well magnetic property must be obtained by the different synthesis methods, in order to achieve the application in molecular units.(3) Used Ni(mnt)₂^- as anion templet, some new metal bis-1,2-dithiolene complexes were obtained by the reaction of different cation ions. Through the magnetic measurement, it could be found that a small change was existed in magnetic property of compounds formed of different cation ions which might supply some inspirations in molecular units.