Syntheses,Structre And Property Studies Of Coordination Polymer By Semi-rigid Nitrogen-containing Carboxylic Acid Ligands

Coordination polymer is a combination of inorganic and organic materials and its structure shows diversity and high stability.It is very important to design and synthesize coordination polymers with specific properties.The properties of coordination polymers depend not only on metal ions but also on organic ligands.In recent years,research work on synthesis of coordination polymers using semi-rigid nitrogen-containing carboxylic acid ligands has received extensive attention.In this paper,the target product is synthesized by the coordination of semi-rigid nitrogen-containing carboxylic acid ligands with metal ions.The study of the performance of the target product lays a theoretical foundation for the coordination polymer to become a potential application material.Three kinds of self-designed organic ligands were synthesized by nucleophilic substitution reactions,respectively 5-[N,N-bis(5-Methylisophthalic acid)amion]isophthalic acid(H₆bmia),4-[N,N-bis(5-Methylisophthalic acid)amion]benzoic acid(H₅bmbc),N,N?-bis(5-Methylisophthalic acid)amion]benzoic acid(H₄bapa).Using Ligand H₆bmia to synthesize three novel structures with Zn²⁺,Cd²⁺,and Cu²⁺,respectively.One novel structure were synthesized using ligand H₅bmbc and Mn²⁺,respectively.Using the ligands H₄bapa and Co²⁺as raw materials,one kind of novel structure compound was synthesized without adding an ancillary ligand.Two kinds of novel coordination polymers were synthesized by adding auxiliary ligands with different structures and lengths.Theeightcompoundsare{[Zn₃O(bmia)(H₂O)₃]·[Zn(H₂O)₆]·3H₂O}_n(1),{[Cd₃(bmia)]·NH(CH₃)₂}_n(2),{[Cu₃(bmia)(H₂O)₃]·5H₂O}_n(3),{[Mn₂(bmbc)(H₂O)₂]·Et OH·3H₂O}_n(4),{[Co₂(bapa)]·2H₂O}_n(5),{[Co(H₂bapa)(bpy)]·3H₂O}_n(6),{[Co₂(bapa)(bpp)]·H₂O}_n(7).The above eight compounds were analyzed by X-ray single crystal diffraction to determine the structure of the compound,and then characterized by powder XRD,thermogravimetric analysis,elemental analysis,and fluorescence detection.Among these eight compounds,compounds 1,2 have good fluorescence properties,and compound 3 has a good pore structure.Using Compound 1 to detect and analyze antibiotic compounds in the simulated wastewater environment,two types of antibiotics are mainly tested,one is sulfonamide antibiotics,and the other is antibiotics.The experimental results show that compound 1 has good selectivity for SQX in sulfonamide antibiotics and OFX in antifloxacin antibiotics.Using compound 2 to detect and analyze six aromatic nitro explosives in DMF,the experimental results show that compound 2 has strong selectivity for TNP.Compound 3 was used to adsorb contaminant dyes in water.The experimental results show that compound 3 has high adsorption performance to gentian violet..It is indicated that compounds1,2 have potential application value for the detection of pollutants,and compound 3 has potential application prospects for the adsorption of pollutants.