Construction And Study Of Magnetization Reversal Metal Formate Frameworks

The design and construction of magnetic materials with negative magnetic susceptibility is a challenging subject.In this paper,based on the ammonium metal formate frameworks,the magnetically reversal of the compound was realized by changing the ammonium cations template or using metal doping method by means of solvothermal and microwave-assisted methods.In addition,we successfully synthesis a novel structure of the new lanthanide metal complexes,which showed good fluorescence properties.1.1,3-propanediamine,3,3'-diaminodipropylamine and 1,4-butanediamine was used as template respectively to construct complexes[NH3(CH2)3NH3]1.1n[Fe?2.2Fe?0.8(HCOO)9]n(1),[NH3(CH2)3NH2(CH2)3NH3]0.8n[Fe?2.4 Fe?0.6(HCOO)9]n(2)and[NH3(CH2)4NH3]0.9n[Fe?1.8Fe?1.2(HCOO)9]n(3).Compounds 1-3 have the same topological structure(49·66)belong to the polar Space Group P 6322 in hexagonal.In the aspect of magnetic properties,compound 1 exhibits spin canted characteristics,compound 2 exhibits regular ferrimagnetic characteristics and compound 3 achieved magnetization reversal.2.Three metal formate frameworks[CH3NH2CH3]n[Cr?0.4Fe?0.6Fe?(HCOO)6]n(4)?[CH3NH2CH3]n[Cr?0.3Fe?0.7Fe?(HCOO)6]n(5),[CH3NH2CH3]n[Cr?0.2Fe?0.8Fe?(HCOO)6]n(6)were synthesized by the addition of metal Cr? to the iron formate frameworks.Compounds 4-6 are all isomorphic with the same topology(412 · 63)(49 · 66),belong to the P31c Space Group.The compounds exhibit different magnetic characteristics due to the different amounts of Cr? doping in the compounds.Compounds 4-6 are typical ferrimagnetic magnets.Compound 6 exhibit significant negative magnetization with the decrease of Cr 111 doping amount.Compound 5 and 6 exhibit exchange bias effect in the system,they have different EB direction and HEB thus the magnetic properties are controlled.3.In the research of metal complex with fluorescence properties,we choose the lanthanide metal Terbium as the object of study and its complexation with acetylacetone was carried out to obtain the denary acetylacetone complex Tb10(Acac)16(OH)14 · 2H2O(7)which has fluorescent properties.By controlling the reaction rate and the pH value of the solution,the acetylacetone-terbium clusters with multiple structure were synthesized and showed great fluorescence properties.