| As a new type of functional material,rare earth complexes not only have attractive topological structure,but also possess potential applications in luminescence,catalysis,magnetism,gas separation and so on.In this dissertation,fourteen dinuclear rare earth complexes have been assembled utilizing the 3-methoxysalicylaldehyde-2-aminobenzoylhydrazone(H2L)and three?-diketone ligands(Hdbm=1,3-diphenyl-1,3-propanedione,Hacac=acetylacetone,Hbeac=1-phenyl-1,3-butanedione).Some basic characterizations of these complexes are analyzed,and the magnetic properties are studied.The main results are as follows:1.Fourteen dinuclear rare earth complexes have been assembled utilizing the 3-methoxysalicylaldehyde-2-aminobenzoylhydrazone(H2L):[RE2L(HL)(acac)3]·3CH3CH2OH(RE=Eu(1),Tb(2),Dy(3),Ho(4),Er(5)),[RE2L(HL)(dbm)3](RE=Eu(6),Tb(7)),[Dy2L(HL)(beac)3](8),[Dy2(HL)2(Ph COO)4]·CH3OH·H2O(9),[Yb2L2(dbm)2(CH3OH)2]·CH3OH(10),[RE2(L)(HL)(dbm)2(CH3COO)]·3CH3OH(RE=Y(11),Dy(12)),[RE2(L)(HL)(dbm)2(CH3COO)]·2CH3OH(RE=Ho(13),Er(14)).The two Yb?centers of 10 are simply bridged by two?-Ophenoxide atoms from two antiparallel ligands.The two DyIII ions of 9 are bridged by two oxygen atoms in hydroxyl from HL–and four oxygen atoms of Ph COO-.The two REIII ions of 1-8 are bridged by two oxygen atoms in hydroxyl from Schiff base ligand and one oxygen atom of co-ligand.The two metal centers of 11-14 are bridged by two oxygen atoms of CH3COO-ion and two?-Ophenoxide atoms from ligand.2.The studies on magnetic properties for complexes reveal that 3 and 8 exhibit slow magnetic relaxation behavior,typical of SMMs behavior,resulting in the energy barrier of 140 K for 3 and 75 K for 8.The distribution coefficient(?)of 3 and 8 are0.19–0.25 and 0.12–0.44 respectively.This work demonstrates that the magnetic properties can be modulated by subtle changes in the coordination environment resulting from changes in the substituents of co-ligands. |
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