Syntheses And Properties Of Cyano-bridged Polynuclear Transition Metal Complexes

With the continuous development of science and technology,new type of molecular magnetic materials has attracted more and more attention.These materials have many advantages,such as structural diversity,small density.And when external conditions have changed(such as temperature,light,Pressure,solvent,and magnetic field),these magnetic molecules can occur the inter-molecular charge-transfer induced spin transition,thus make the whole molecular spin state changed,this is what we usually called CTIST behavior(charge-transfer induced spin transition).The first chapter,we summarized the research progress of magnetic materials,the present research progress of the charge transfer complexes.In the second chapter,4-di-tert-butyl-2,2'-bipyridine was used as the ligand,and[NEt4]Tp*Fe(CN)3(Tp*=3-(3,5-dimethyl pyrazole)borate)was used as the building block,then they were assembled with a series of transition 1etal ions(such as Ni2+,Zn2+,Cu2+and Fe2+)to obtain four compounds,{[Tp*Fe(CN)3]2[M(dtbbpy)2]2}(Clo4)2·-2MeoH(M=Ni2+,Zn2+,Fe2+,dtbbpy=4-di-tert-butyl-2,2'-bipyridine),{[Tp*Fe(CN)3]4-[Cu(dtbbpy)]2}(ClO4)2·2MeOH.The structures and properties of these complexes have been characterized by mass spectrometry and infrared spectroscopy.And the compound{[Tp*Fe(CN)3]2[Fe(dtbbpy)2][Co(dtbbpy)2]}(ClO4)(PF6)·2MeOH(5·2MeOH)was obtained by the assembly of[NEt4]Tp*Fe(CN)3,4-di-tert-butyl-2,2'-bipyridine,Fe2+ and Co2+.The content of iron and cobalt was analyzed by full-spectrul direct reading inductively coupled plasma-atomic emission spectrometer,and the molecular weight was determined by mass spectrum.The property of the charge transfer was studied by temperature-dependent infrared spectra for 5.Finally,the property of the charge transfer of the compound 5 was confirmed by magnetic measurements.In the third chapter,[Ph3P]TpMeFe(CN)3(TpMe=3-(4-methyl pyrazole)borate)was assembled in DMF with Fe2+,eo2+to obtain compound {[TpMeFe(CN)3]6[Co(DMF)]6}·-DMF(6).And compound {[TpFe(CN)3]6[Fe6(DMF)18]}·12DMF(7)was obtained by assembled with Fe2+ and[NBu4]TpFe(CN)3(Tp=3-pyrazole borate)in DMF solvent.The valence states of Fe and Co atoms were confirmed by infrared spectroscopy.And the magnetic properties of these two compounds were further tested.The fourth chapter,summary of this paper,was used to make a further outlook.