Controllable Synthesis And Properties Of Functinonal Lanthanide Complexes

As an important branch of complexes,rare-earth complexes have received more and more attention due to their unique properties and rich variety of topological structures.The most prominent of these is the study of unique luminescence properties brought about by its 4f electrons.Studies have shown that rare earth complex luminescent materials have a wide range of application prospects,such as photoluminescence,catalysis,fluorescence probes,up-conversion luminescence,nuclear magnetic resonance imaging,biosensing,and biomarkers.drug control release and so on.In terms of structure,rare earth ions have a higher coordination number than transition metals,thus forming many novel and unique structures.Based on this,this paper mainly uses the two methods of room-temperature volatilization and hydrothermal synthesis which are simple,feasible and low cost,a series of novel coordination polymer structures centered on three lanthanide metal ions,Tb³⁺,Eu³⁺,and Gd³⁺,have been successfully prepared.The exact structures were determined through the single crystal X-ray diffraction and shelxtl software analysis,and their luminescence properties and detection applications were further studied.The main contents of this paper are as follows:?1?Controllable fabrication of 1D,2D and 3D rare-earth coordination polymer single crystals based on 1,3-adamantanediacetic acidIn this chapter,three series of 3D Tb³⁺?1a?,2D Eu³⁺?2a?,Gd³⁺?2b?,and Tb³⁺?2c?,1D Eu³⁺?3a?,Gd³⁺?3b?,and Tb³⁺?3c?different dimensions of rare earth coordination polymers were prepared by a simple hydrothermal synthesis method using1,3-adamantanediacetic acid as an organic ligand.Through the single crystal X-ray diffraction test and structural analysis,complex 1a is crystallized in the orthorhombic Pna21 space group;complexes 2a-2c are crystallized in the triclinic P-1 space group;and complexes 3a-3c are crystallized in the monoclinic P2?1?/n.The luminescence properties of this series of coordination polymers were studied in detail.?2?Single crystal structure analysis and luminescent properties of rare earth complexes based on 4-iodo-3-methylbenzoic acidIn this chapter,4-iodo-3-methylbenzoic acid?IMBA?was used as an organic ligand and 4,7-dimethyl-1,10-phenanthroline?dmp?was used as an ancillary ligand,rare earth complexes with Tb³⁺?4a?,Eu³⁺?4b?and Gd³⁺?4c?as the central metal ions were successfully prepared through the method of simple and low-cost hydrothermal synthesis.According to the single crystal diffraction test and structural analysis,they crystalize in the triclinic space group P-1,take complex 4a as an example,the single crystal parameters are a=16.3716?7??,b=16.9358?6??,c=17.5775?4??,?=65.098?3?°,?=80.207?3?°,?=62.461?4?°,V=3917.8?3??³,Z=2.Meanwhile,a detailed study of its luminescence properties was conducted.In addition,we found that solvent molecule diethyl ether has a strong quenching effect on complex 4b,through which we can use complex 4b as a fluorescent probe to detect the presence of diethyl ether.At the same time,we also found that the complexes 4a and 4b have a good detection effect on Fe²⁺.?3?Synthesis and luminescent properties of single crystal structure of rare earth complexes based on 3-bromo-2-pyridinecarboxylic acidThrough a simple and feasible room-temperature volatilization method,Tb?NO₃?₃?6H₂O,Eu?NO₃?₃·6H₂O and Gd?NO₃?₃·6H₂O metal ion sources are used,and 3-bromo-2-pyridinecarboxylic acid?BPCA?is used as organic ligand,rare earth complexes with Tb³⁺?5a?,Eu³⁺?5b?and Gd³⁺?5c?as the central metal ions were successfully synthesized.According to the single crystal structure analysis,they crystalize in the triclinic space group P-1,in which complex 5a is taken as an example,the unit cell parameters are a=11.4534?4??,b=12.2747?6??,c=22.1354?8??,?=83.367?4?°,?=88.342?3?°,?=88.457?3?°,V=3089.0?2??³,Z=1.At the same time,the luminescence properties of Tb?III?and Eu?III?complexes were also investigated in detail.In addition,we found that complex 5b can easily detect potassium ions.