Studies On The Construction And Detection Properties Of Three Complexes Based On 4-(pyrimidine-5-yl) Isophthalic Acid Ligands

In recent years,a branch in the field of inorganic chemistry,the MOFs(Metal-Organic Framework),has been greatly developed.In the past a quarter century,a lot of researches have been conducted on MOFs.It is a series of materials composed of metal ions and suitable organic ligands,which usually have infinitely extending two-dimensional or three-dimensional structures.In recent years,not only because of its special structure,but also because of its catalysis,induction(for example,some MOFs show excellent luminous properties in detecting cations,anions,gases and organic molecules),gas storage and separation,etc.With a wide range of application prospects in the direction,MOF materials have been favored in many aspects,among which light-emitting metal organic framework(LMOF)-type crystal materials have ushered in rapid growth.Now,environmental protection has been paid more and more attention.For this reason,it is important to develop new,efficient and accurate detection methods.In this paper,4-(pyrimidin-5-yl)isophthalic acid were chosen as ligands,and the common coordination elements lead and zinc were used as central atoms,at the same time,the synthetic process of cadmium Complex was improved,and the detection performance of the three Complexes was studied.The specific research content of this article includes the following parts:(1)Metal-organic frameworks 1(C12H8Zn2N2O7),2(C15H13Pb N3O5)and 3(C12H12Cd N2O7)were synthesized by hydrothermal method.The structure of the Complex was measured and characterized by X-ray single crystal diffraction technology,and crystal data collected were used to analyze crystal structure characteristic.(2)UV-Vis spectroscopy and fluorescence spectroscopy were used to study the fluorescence properties of Complex 1.The detection limit were as low as 6.9 ?M(Cr O4)and 4.7 ?M(Cr2O7),and the concentration range of Cr O42-and Cr2O72-was 0-0.04 mm.In addition,selective experiments were carried out,and the results showed that the Complexes still had excellent detection performance even under the interference of other ions.The detection ability of Complexes is mainly due to competitive absorption / electron transfer.(3)UV-Vis spectroscopy and fluorescence spectroscopy were used to study the fluorescence properties of Complex 3.Complex 3 is highly selective for Mn O4-and Fe3+ in aqueous solution,the detection limit is 2.1 ?M(Fe3+)and 0.08 ?M(Mn O4-),and both can be detected quantitatively in the concentration range of 0-0.4 mm.In addition,selective experiments were carried out,and the results showed that the Complexes still had excellent detection performance even under the interference of other ions.The detection ability of Complexes is mainly due to competitive absorption / electron transfer.