Study On The Structure And Properties Of Coordination Polymers Constructed By Aromatic Group Modified Amino Acid Derivatives

The Porous Metal-Organic Framework(MOF)is a type of multifunctional polymer material with a distinctive topology structure and adjustable aperture diameter.They are promising in ion transport,imaging,catalysis,gas storage and separation.Currently,the method of synthesizing MOF is very ripe.According to literature reports,a large amount of MOF has been synthesized by solvothermal method.Therefore,this topic mainly uses solvothermal as the synthesis method,chooses different chiral organic ligands as the main ligand,adjusts by auxiliary ligands,and constructs a chiral MOF with metal ions.In this paper,we reviewed the research team's literature and expertise and selected metal ions such as Cu²⁺,Co²⁺,Eu³⁺,Tb³⁺and different mixed ligands to construct six chiral MOFs.It also includes a subset of other properties such as polymer adsorption,chiral identification,and creative structural analysis,radiographic analysis(PXRD),temperature analysis,cycle dichroism,and infrared.The research of sex recognition and other properties.The explore content is divided into three parts:1:1-mono(L-alanine)p-benzoic acid and Zn²⁺,Co²⁺chiral complexesUsing the main ligand 1-mono(L-alanine)p-benzoic acid(H₂L1),the auxiliary ligands bpee and bpea were self-assembled with Zn²⁺and Co²⁺under different conditions to obtain complexes Y-1,Y-2.When the chiral ligand H₂L1 independently assembles with metal ions,the carboxyl group of the benzoic acid part adopts the double bridging mode,and the carboxyl group of the alanine part adopts the double chelate mode.At the same time,it forms a two-dimensional layer under the adjustment of the auxiliary ligand.The layer bilateral ultimately implements the supramolecular structure of 3D support integration.It is found through experiments that when the auxiliary ligand is changed from bpea to bpee,the two-dimensional layered coordination polymer with the same structure has dye adsorption performance.The Y-1 constructed by bpea has no adsorption to the dye,and the Y-2 constructed by bpee participates in the construction.Y-2 shows good adsorption selectivity for dyes.It can quickly and selectively adsorb the basic anionic dyes methyl orange and Congo red.The PXRD characterization shows that the skeleton of Y-2 does not change after desorption of methyl orange,which proves its adsorption performance stable.But bpea participates in the construction of Y-1 and cannot absorb dyes.2:A chiral complex constructed by 1,4-bis(L-proline)p-benzoic acid and Cu²⁺Using the main ligand 1,4-bis(L-proline)p-benzoic acid,and the auxiliary ligands bpea and bpee with Cu²⁺under different conditions,constructed 3D coordination polymer Y-3 and Y-4.Both Y-3 and Y-4 are 3D coordination polymers formed by woven left-handed spiral chains of different angles formed by metal and chiral main ligands and spiral chains of left hand formed by accessory ligand,respectively.In Y-3,Cu²⁺ions,chiral ligands and bpea form simple spiral chains of left hand.The difference is that in Y-4,Cu²⁺ions and chiral ligands form four different types of left-handed helical chains,and the left-handed helical chains composed of Cu²⁺ions and bpee ligands connect the four spiral chains together.Because of the auxiliary ligand bpee in Y-4,we explored the selective adsorption of dyes by Y-4,and found that it can still selectively adsorb basic anionic dyes,but cannot desorb the adsorbate by means such as soaking.Experiments have proved that the selective adsorption performance of the dye has nothing to do with metal ions,but has a close relationship with the structure and the existence of bpee ligand.In addition,due to the double helical structure in Y-4,we explored the responsiveness of its chiral amino acids.The UV absorption signal of the chromophore is amplified,but the amino acid of the optical isomer cannot be recognized.Therefore,the cyclic voltammetry curve of Y-4 was measured by an electrochemical workstation,and it was found that Y-4 can be used for chiral identification of D/L tryptophan by electrochemical methods.3:Chiral complexes of 1-(L-proline)-benzoic acid with Tb³⁺and Eu³⁺Using the main ligand 1-(L-proline)-benzoic acid,the auxiliary ligand 1,10-phen and the rare earth metals Eu³⁺and Tb³⁺under solvothermal build up to the complexes Y-5,Y-6,the main ligand The coordination mode of the body is the same in Y-5 and Y-6.The chiral ligand connects the rare earth ions to form a two-dimensional layered polymer.The auxiliary ligand 1,10-phen plays a role in adjusting the connection direction.Due to the lanthanide shrinkage effect of the rare earth ions,Y-5/Y-6 The structure is the same,and through fluorescence analysis,it is found that the two are potential luminescent materials,which can be used as fluorescent probes.