Molecular Assembly Of Nitronyl Nittroxide-Metal Functional Complexes

Molecular-based materials is an important branch of magnetic materials. The metal-radical approach has become one of the very promising strategies for the design and synthesis of molecular based magnetic materials in this field. In this paper, the main content is the design and synthesis of complex of the nitronyl nitroxide-metal complexes, and characterized by elemental analysis, IR analysis, UV analysis, X-diffraction analysis, and Magnetic Analysis. Include the following:We have successfully obtained eight kinds of nitronyl nitroxide and four kinds of oxalamide macrocycle.Using the nitronyl nitroxide of 3-methyl thienylphenyl act as organic ligands to react with hexafluoroacetylacetonate salt of rare earth metals and transition metals,8 complexes were obtained. Crystal structure analysis for Dy(hfac)3(NITTh-m-CH3)2 and Tb(hfac)3(NITTh-m-CH3)2 reveal that the complexes are mononuclear triclinic system. The Dy(Ⅲ) and Tb(Ⅲ) ions are eight-coordinated in slightly distorted dodecahedron geometry. Nitronyl nitroxide of 3-methyl thienylphenyl, as bridge ligand, connect Dy(Ⅲ) and Tb(Ⅲ) ions to form a three-dimensional chain structure.Using the nitronyl nitroxide of 3-benzyloxyphenyl to react with hexafluoroacetylacetonate salt of rare earth metals and transition metals,7 complexes were obtained. Crystal structure analysis for Cu3(hfac)6(NITPh-m-OCH2-Ph)2 reveal that the complex is mononuclear triclinic system. The Cu1(Ⅱ) ions with two oxygen atoms of the N-O group from nitronyl nitroxide radicals and six oxygen atoms from three different hfac anions are obtained five-coordinated in slightly distorted Tetrahedron. There are no intermolecular hydrogen bonds.Using the 4’-dimethylamino-phenyl-4,4,5,5-tetramethylimidazoline-l-oxyl-3- oxide, 4’- fluorophenyl -4,4,5,5-tetramethylimida-zoline-l-oxyl-3-oxide) and 4’-bromophenyl-4,4,5,5-tetramethylimida-zoline-l-oxyl-3-oxide) to react with hexafluoroacetylacetonate salt of rare earth metals,6 complexes were obtained. Magnetic measurements indicate that there are the weak magnetic interaction between the metal ions and radicals.The anti-bacterial properties of the rare earth chloride, nitronyl nitroxide and rare earth-radical complexes was determined by the filter paper diffusion method to measure the size of their inhibition zone diameter. The results showed that the Dy- complexes have better antibacterial effect. All the research provided scientific experimental basis for design, synthesis and application of new rare earth metal-radical molecule materials.