Synthesis And Properties Of Metal-organic Coordination Polymers Containing Nitrogen And Carboxyl Ligands

As a new type of crystalline material,metal-organic coordination polymers are formed by the assembly of organic linkages and metal centers by coordination bonds,which have attracted great attention in the past two decades.Due to its adjustable structure and controllable properties,coordination polymers can be endowed with a variety of functions that have outstanding properties in terms of storage,separation,catalysis,luminescence,sensing,and so on.In recent years,more and more researchs have focused on the construction of coordination polymers with multifunctional applications,and a large number of coordination polymers with novel structures and excellent properties have been synthesized.But the controllable assembly of such materials is still very challenging.In this paper,12 novel metal-organic coordination polymer materials were constructed by hydrothermal and solvothermal methods.Furthermore,we characterized their structures and explored the properties of catalysis,adsorption of organic dyes,solid-state fluorescence etc.The specific research contents are as follows:?1?Three different dimensional copper coordination polymers were synthesized by 3-pyrazinyl-1,2,4-triazole?Hpzta?as the main ligand and carboxylic acid auxiliary ligand.A two-dimensional copper coordination polymer was constructed by using1,4-bis?1-imidazolium?benzene?bib?as the main ligand.The catalytic properties of these four copper complexes were studied,HL-2 has the best catalytic reduction effect on 4-nitrophenol?4-NP?.?2?Using 2',6'-dimethyl-[1,1'-biphenyl]-3,4',5-tricarboxylic acid?H₃L?as the main ligand with the introduction of the auxiliary ligand 1,4-two?Pyridin-4-yl?benzene?bpb?and 4,4'-bis?1H-imidazol-1-yl?-1,1'-biphenyl?bibp?,respectively,six three dimensional coordination polymers with novel structures were constructed by adjusting different metal salts and synthesis conditions.It reveals that all the compounds exhibit good hydrothermal stabilities.Anionic HL-7 not only can adsorb cationic organic dyes by ion-exchanges,but also show tunable luminescent properties.Moreover,HL-8 presents good photocatalytic performance,while HL-9 shows excellent selective adsorption properties of organic dyes and effective catalytic properties towards the carbon dioxide cycloaddition reaction.?3?A 1D cobalt complex?HL-11?and a 3D cadmium complex?HL-12?have been synthesized by using 4,4'-?1H-1,2,4-triazol-1-ylmethylene?dibenzoic acid?H₂tmdb?and 6-?4-pyridyl?-terephthalic acid?H₂pta?as ligand,respectively.HL-11 shows good catalytic reduction performance of 4-NP.Furthermore,the solid-state luminescent properties of HL-12 at room temperature have been studied as well.