Syntheses,Structures And Properties Of Complexes Constructed From Benzenesulfonic Terpyridyl Ligands

At present,with the in-depth study of complexes by scientific researchers,people are focusing their attention on the purpose of regulating the reaction conditions to achieve the expected purpose of the experiment.Therefore,it has become a research hot spot to obtain complex structures and excellent properties through reasonable design.In this thesis,3-HSTP and 4-HSTP were used as the main ligands to react with transition metal ions through hydrothermal reaction.Complexes with novel structures and excellent properties were successfully obtained,and they had 7 different dimensional structures.And through a series of characterization methods,including infrared spectroscopy,ultraviolet spectroscopy,PXRD,X-ray single crystal diffraction and other test methods,the structure of complexes was compared and discussed.In addition,through thermogravimetric analysis and fluorescence spectroscopy,the stability and sensing aspects of the complexes were studied,and the potential application value of the complexes was explored.There are three chapters in this article.The introduction is as follows:Chapter 1:We systematically summarizes the application of coordination polymers and their common preparation methods,and reviews the application of complexes and the research progress of terpyridine derivatives through the literature.Chapter 2: We uses the 3-HSTP ligand as the organic linker and the transition metals Cd(II)and Co(II)as the metal center to construct five complexes.Among them,complexes 1,2 and 3 are due to the structural changes caused by the introduced anions.Complex 1 is a two-dimensional layered compound,then complexes 2 and 3 are isomorphic that they are bridged by halogen elements to form a three-dimensional structure.In addition,complexes 4 and 1 are isostructural.But under the condition of only changing the p H value,a mononuclear compound 5 is obtained.The molar magnetic susceptibility and magnetization of complexes 4 and 5 were measured.Through the measurement of fluorescence spectroscopy,a complex with excellent fluorescence was selected for sensing experiment and it was found that acetone and dichromate can quench the complex 3,and the quenching efficiency is above 95%.And calculated Ksv and the detection line.The results show that complex 3 can be used as a fluorescent probe.Chapter 3: We selected 4-HSTP as the main ligand,based on Zn(II)ions,introduced the auxiliary ligand terephthalic acid,and obtained 4 complex structures.Among them,complexes6 and 7 may add a hydroxyl functional group to the pyridine ring due to the catalytic effect of zinc acetate.Due to the introduction of auxiliary ligands,the structural changes of complexes6 and 7 were discussed.Under the condition of changing the metal salt to zinc chloride,complexes 8 and 9 were obtained.Through the fluorescence spectra and lifetime tests of complexes 8 and 9,complex 8 was selected for fluorescence sensing experiments.The results show that Fe(III)ions and dichromate ions can have a significant fluorescence quenching effect on complex 8,and their quenching mechanism has been explored.For Fe(III)ions,XPS experiments show that it may be due to the interaction of Fe with the N and O on the pyridine ring,which caused electrons to transfer.Ultraviolet spectroscopy experiments show that the fluorescence excitation spectrum of complex 8 overlaps with the ultraviolet absorption spectrum of dichromate radicals.This phenomenon may lead to light competitive absorption,thereby triggering the fluorescence quenching of complex 8.In addition,thermal stability experiments have been performed on all complexes.