Synthesis,Structures And Luminescent Properties Of Lanthanide/lanthanide-transition Metal Coordination Complexes

Lanthanide/lanthanide-transition metal coordination complexes not only have attractive structures,but also become a research hotspot because of their potential applications in the fields of single-molecule magnets and low-temperature thermometers.In the past ten years,most of the lanthanide/lanthanide-transition metal coordination complexes were synthesized by hydrothermal/solvothermal methods.we synthesized four lanthanide metal coordination polymers?compounds 1-4?,two zero-dimensional lanthanide-transition metal clusters?compounds 5 and 6?,and two cases of zero-dimensional lanthanide-transition metal complexes?compounds 7 and 8?under hydrothermal conditions.A 2D lanthanide metal coordination polymer,namely[Ho₂?C₄O₅H₄?₃?H₂O?₄]·2H₂O?1?,hydrothermal synthesis from rare earth metals Ho and 2,2'-oxybisaceticacid?C₄O₅H₆?ligand.Compound 1 crystallizes in the orthorhombic space group C222₁.This compound is a 2D layered structure by lanthanide Ho ion interconnecting with the carboxyl oxygen atom on the 2,2'-oxybisaceticacid ligand.A 3D lanthanide metal coordination polymer,namely Gd₂(C₁₄O₅H₈)₃?H₂O?₄?2?,hydrothermal synthesis from rare earth metals Gd and 4,4'-Diphenyl ethyl dicarboxylic acid(C₁₄O₅H₁₀)ligand.Compound 1 crystallizes in the monoclinic space group P2₁/c.The lanthanide Gd ion in the compound is connected to the oxygen atom on the 4,4'-Diphenyl ethyl dicarboxylic acid ligand to form a 2D layer,and the layer is connected through the ligand oxygen atom to form a 3D skeleton structure.A 3D lanthanide metal coordination polymer,namely[Dy2?ida?3]·H2O?3?,hydrothermal synthesis from rare earth metals Dy and Iminodiacetic acid?H₂ida?ligand.Compound 3 belongs to the tetragonal crystal system,the space group is I41/a.The lanthanide Dy ion in the compound is connected to the oxygen atom on theIminodiacetic acid ligand to form a 2D layer,and the layer is connected through the ligand oxygen atom to form a 3D network structure.A 3D lanthanide metal coordination polymer,namely[Ho₂?2,3-pzda?₃?H₂O?₅]·3H₂O?4?,hydrothermal synthesis from rare earth metals Ho and 2,3-Pyrazinedicarboxylic acid?2,3-pzdaH2?ligand.Compound 4 belongs to the triclinic system and the space group is P-1.The lanthanide Ho ion in the compound is connected to the oxygen atom on theIminodiacetic acid ligand to form a 2D layer,and the layer is connected through the ligand oxygen atom to form a 3D network structure.The use of 2-Hydroxy-2,2-diphenylacetic acid(C₁₄O₃H₁₂),Titanium?IV?oxysulfate dihydrate and rare earth nitrates has led two zero-dimensional lanthanide-transition metal clusters[LnTi??₃-O?(C₁₄O₃H₁₀)₃?H₂O?₄]·H₃O[Ln=Eu?5?,Tb?6?].Compounds 5 and 6belong to the monoclinic system,space group C2/c.Rare earth ions and titanium ions are linked by two?_3-O ions to form a tetra-nuclear[Ln₂Ti₂??₃-O?₂]cluster core,tetra-nuclear[Ln2Ti2??3-O?2]cluster core is surrounded by six 2-Hydroxy-2,2-diphenylacetic acid ligands.Aspects of the fluorescence properties and fluorescence-temperature response of compounds 5 and 6 are discussed.We synthesize two zero-dimensional lanthanide-transition metal coordination complexes Ln₂Ti₂(C₁₄O₃H₁₀)₆?C₄O₅H₄?₂?H₃O?₂[Ln=Eu?7?,Tb?8?],by employing the2,2'-oxybisaceticacid,2-Hydroxy-2,2-diphenylacetic acid,Titanium?IV?oxysulfate dihydrate and rare earth nitrates.Compounds 7 and 8 belong to the monoclinic system,space group P21/c.Rare earth ions and titanium ions are linked by ligand to form a tetra-nuclear[Ln₂Ti₂]coordination complexes,Compound 7 was tested for fluorescent properties.