| In recent years,because metal-organic framework materials have excellent potential applications in their structure,heterogeneous catalysis,gas adsorption,magnetism and luminescence,their research has attracted widespread attention.However,the synthesis of metal-organic framework complexes with specific properties is still a difficult task.In this article,several dicarboxyl ligands and various nitrogenous ligands were selected to react with metal ions under hydrothermal/solvothermal conditions,and thirteen metal-organic frameworks with novel structure and excellent performance have been synthesized.The compounds were characterized and tested by X-ray single crystal diffraction,powder X-ray diffraction,infrared analysis,thermogravimetric analysis,elemental analysis,fluorescence analysis,and ultraviolet analysis.The results are as follows:1.Seven compounds with excellent properties have been synthesized by dicarboxyl ligands 1-(4-carboxylphenyl)piperidine-4-carboxylic acid(H2cppc)and chiral carboxylic acid ligand N-(2-carboxylbenzyl)-L-glutamic acid(H3L?)under hydrothermal/solvothermal conditions,namely:{[Cd(cppc)(bimb)](H2O)4}n(1),{[Zn(cppc)(bibp)](H2O)(DMF)}n(2),{[Zn(cppc)(bif)](H2O)4}n(3),{[Zn L(bibp)](H2O)2}n(4),{Pb L}n(5),{Sr L(DMF)}n(6),{Sr L}n(7),compound 1presented a 5-fold interpenetration of dia net,compound 2 featured a 6-fold interpenetration of dia net with double helix chains,compound 3 featured a 6-fold interpenetration of dia net,compound 4 presented a 5-fold interpenetration of dia net,compound 5 featured a 3D network structure,compound 6 presented a 3D network structure by?-?stacked,and compound 7 showed a 3D network structure.Subsequently,the properties of the compounds were in-depth researched.Compounds1,2,and 3 had good fluorescence properties,of which 1 could be used as a potential fluorescent material for detecting Fe3+ions in aqueous solutions.The Ksv of 1 was1.02×105 M-1.The three compounds had a significant sensitizing effect on ECL signals,especially 2 and 3 could reach as much as five times.Circular dichromatography experiments showed that compound 4 had chirality.In addition,the adsorption capacity of 1 on Congo red could reach 589 mg·g-1,the adsorption capacity of 2 and 4 on methyl orange was 88 mg·g-1 and 247 mg·g-1,three compounds could be used in the stationary phase of the chromatography column to rapidly filter organic dyes Congo red or methyl orange.2.Six novel complexes with excellent properties have been synthesized by mixed carboxylic acid ligand 4,4?-(1H-1,2,4-triazol-1-yl)methylene-bis(benzonic acid(H2tmdb),4-(3,5-dicarboxylphenyl)-4,2':6',4''-terpyridine(H2dpht)was synthesized under hydrothermal/solvothermal conditions,namely:{[Pb(tmdb)](H2O)}n(8),{[Zn(tmdb)(bimb)0.5]}n(9),{[Zn3(tmdb)3(bpmb)1.5](H2O)6}n(10),{[Co(dpht)](H2O)3}n(11),{[Pb2(dpht)2](H2O)5}n(12),{[Cd2(dpht)2(bibpy)2](H2O)4}n(13),compound 8 presented a 2D layered structure,compound 9 featured a 4-fold interpenetration of dmc net with double helix chains,compound 10 presented a 3-fold interpenetrating 3D network,compound 11 featured a 2-fold interpenetrating 3D network,compound 12 presented a 2D layered structure,compound 13 featured a 3D network structure.Among them,compound 9,10 and 13 had good fluorescence properties and compound 9 and 10could be used as a fluorescent probe to detect Fe3+ions in an aqueous solution,the Ksv was 3.06×105 M-1 and 1.07×105 M-1.9 and 10 had a significant sensitizing effect on ECL signals.At the same time,the experimental results of catalytic degradation of dyes under light showed that two compounds could effectively degrade methylene blue or methyl orange.Gas adsorption experiments showed that compound 10 can effectively adsorb CO2,the adsorption capacity reached 58.85 cm<sup>3·g-1 at 273 K. |
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