| Metal-organic frame materials(MOFs) are highly crystalline porous materials,which have the characteristics of both organic and inorganic materials.These materials are widely used in adsorption,separation,fluorescence induction,catalysis and many other aspects,and are considered as one of the most promising porous materials.Hydroxybenzoic acid ligands have strong coordination ability and relatively dense oxygen atom coordination site,which makes it easy to construct multinuclear coordination polymers.In this paper,two 2-hydroxyphthalic acid derivative ligands and one bromobenzoic acid ligand were designed:2-hydroxy-benzenetricarboxylic acid ligand(2-OH4btc),3-hydroxy-1,2,4,5-benzotetracarboxylic acid ligand(3-OH5BDC)and 3-bromo-1,2,4,5-benzotetracarboxylic acid ligand(3-Br H4BDC).Theoretically,when 2-OH4btc and 3-OH5BDC coordinate with transition metals,it is easy to form[2+2]binuclear structural units,and then form multinuclear structures on this basis.In order to explore the factors affecting the coordination patterns of these two types of ligands,we used 3-Br H4BDC ligand as the contrast ligand and successfully prepared eight coordination polymers with different structures by using these three ligands and different transition metal ions(Co,Mn,Zn,Cd).The structures of these complexes were studied by single crystal diffraction,and their catalytic,adsorption and fluorescence sensing properties were studied.The factors affecting the structure and properties of hydroxybenzopolyacid complexes were speculated.The specific results are as follows:1.Five Cobalt-based coordination polymers[Co(H2btc)(H2O)3]1,[Co2(Obtc)(H2O)5]·H2O 2,[Co3(Obtc)2(Hbpye)2(H2O)2]3,[Co3(Obtc)2(Hbpy E)2(H2O)2]4,[C o5(Obtc)2(phen)6]·2NO3·2H2O 5 were synthesized under hydrothermal conditions using 2-OH4btc as precursor ligand and Co as metal center.The complex 1 is a mononuclear structure,2 is a binuclear structure,3 and 4 have the same sp atial network structure,is a tri-nuclear structure,5 is a five-nuclear structure.Ex cept for the complex 1,The complexes 2-5 all form a typical[2+2]binuclear structural unit.The OER catalytic performance of complex 1-5 was tested,and t he results showed that complex 3 had the best OER catalytic activity,which la id a foundation for the development of this kind of catalyst materials.2.Three coordination polymers[Zn6(OBDC)2(H2O)6]·8H2O 6,[Cd2(Br BDC)(phen)2H2O]7 and[Mn2(Br BDC)(phen)2H2O]8 with different metal bases were synthesized under hydrothermal conditions using 3-OH5BDC and 3-Br H4BDC l igands as precursor ligands and Zn,Mn and Cd as metal centers.In the comple x 6,although 3-OH5BDC ligand was used,the typical[2+2]binuclear structura l unit was not formed,and the coordination occurred between the phenolic hyd roxyl group and the carbon atom on the benzene ring and zinc atom.Complex7 has a similar structure to complex 8.The complex 7 had certain adsorption p roperties for four dyes(MB,MO,Rh B,CV)in water quality,and the adsorpti on relationship of the four dyes was MB>MO>Rh B>CV.The fluorescenc e response of the complexes(6-8)to different metal ions was significantly diff erent.Complex 6 has the best detection ability for Al3+and Co2+in water qua lity,and the detection limit is 0.105 ppm and 0.496 ppm,respectively.Comple x 7 has a good detection ability for Fe3+,and the detection limit is 0.112 ppm.Complex 8 has a good detection ability for Cd2+.The detection limit was 0.074 ppm.3.Summarize the full text,look forward to the follow-up work,The factors affecting the frame structure of the 3-OH5BDC complex were explored.A new complex material with a structure similar to the active center of photocatalysis Ca Mn4O5was designed by controlling the reaction conditions,and its application in photocatalysis was studied?... |
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