Synthesis,Structure And Characterization Of Rare Earth Complexes With Thiourea Ligand

Rare earth complexes have very potential applications in terms of luminescence,magnetism,catalysis,and bioactivity,and for these reasons more and more people are continually exploring them.In the aspect of light emission,rare earth complexes have many applications in rare earth functional materials,biological,medical and analytical chemistry.For example,they are used as anti-counterfeiting materials,color display materials,agricultural luminescent materials,fluorescent probes and fluorescent labels.In terms of magnetism,rare earth complexes have great potential for development in monomolecular magnets.Single molecule magnets have great application prospects in magnetic refrigeration,quantum computers,electronic devices and high density storage.In the catalytic aspect,the potential applications of catalysts for extensive conversion as unsaturated compounds,such as olefin polymerization,hydroisylation cyclization,hydrogenation phosphating,hydrogenation of phosphorylation and hydrosilylation of various unsaturated organic compounds,or as a catalyst in synthetic chemistry.In terms of biological activity,rare earth complexes are widely used in anti-virus,antibacterial,antibacterial,anti-tumor and so on.First,in this paper,o-aminopyridine benzoyl thiourea was used as ligand L~1,which reacted with rare earth chlorides and obtained a series of rare earth complexes Ln(L~1)3{Ln=Tb(1)? Dy(2)? Eu(3)? Ho(4)}by diffusion.The complexes were characterized by UV,IR,fluorescence and single crystal structures.Their spatial structures are similar and are all mononuclear rare earth complexes.The space group belongs to C2 / c and is a nine coordination complex.The coordination environment is composed of the central ions Ln and the two N And an O atom,N atoms from a pyridine ring,one from the thiourea on one of the N,oxygen atoms from the ligand of the acyl group,the nine atoms are not in the same side,the metal atom Ln as the center of the formation of a twisted tetrahedron.And its fluorescence analysis shows that the fluorescence of the complexes comes from the ligand itself.Second,In this paper,p-aminobenzoyl benzoyl thiourea was used as ligand L~2,which reacted with rare earth chlorides and obtained a series of rare earth complexes by solvent evaporation.The complexes were characterized by UV,IR,fluorescence and single crystal structure.The complex belongs to the triclinic system,and its spacegroup belongs to P-1.It can be seen from the structure that the complex is a single-stranded rare earth complex with the center metal of the complex being octahedral and the center metal Ln.The two oxygen atoms on the carboxyl group of a ligand are all coordinated with the metal,and the carbonyl groups on the other two carboxyl groups are also involved in the coordination,and the hydroxyl groups on the other two carboxyl groups are also involved bit,there are two oxygen is from the water molecules also involved in the coordination.The nine atoms are not on the same side,the metal atom Ln as the center of the formation of a twisted dodecahedron.The complex is a one-dimensional single-chain complex whose center metal atom is a carbonyl group with a carboxyl group attached to the hydroxyl group and extended to form a single strand.The complex Tb is green and the complex Eu is red.And the Eu complex were reacted with 1,10-phenanthroline to obtain the another complex10.Complex 10 is a double-core rare earth complex,belonging to the triclinic system,the space group is P-1,the complex metal center is octahedral coordination.Although it is a double-core rare earth complex,but the two central metal ions are in the same environment and symmetrical,with a ligand on the carboxyl group of two oxygen atoms all with the metal coordination,the other two carboxyl groups on the carboxyl groups are also involved in coordination,but also with 1,10-phenanthroline on the two nitrogen atoms.While the fluorescence intensity of complex 10 is stronger than that of complex 7,and its quantum yield is as high as 40%,which is more than 20 times higher than that of complex 7(quantum yield = 2.27%).In this paper,a series of rare earth complexes 11 and 12 were obtained by the reaction of rare earth chlorides with m-aminobenzyl thiourea as ligand L3.And characterized by IR,UV,fluorescence and single crystal structure.The crystal structure shows that the complexes 11 and 12 are isomeric and are binuclear rare earth complexes and belonging to the triclinic system.The space group is P-1.The complex metal is coordinated with the center metal Ln,a ligand on the carboxyl group of two oxygen atoms are all coordinated with the metal,the other two carboxyl groups on the carboxyl group is also involved in coordination,and then the other two ligands on the carboxyl group of hydroxyl oxygen is also involved in coordination,There are two more oxygen from the methanol also involved in the coordination.And the complex 11 emits red light,and the complex 12 emits green light.