Preparation Of Chemical Probe And Its Application In The Detection Of Cobalt Ion,Hydrogen Sulfide And Water Content

With the increasing prominence of environmental pollution problems,it is extremely important to carry out efficient and sensitive detection of environmental pollutants in recent years.The abnormal levels of metal ions not only affect natural ecosystems,but are also closely related to health.Hydrogen sulfide（H₂S）is an important endogenous gas information transmitter,while many diseases are caused by the abnormal concentration of hydrogen sulfide in the body.Therefore,the detection of metal ions and hydrogen sulfide is receiving more and more attention.Water is always regarded as an impurity in many organic activities,and will even hinder the progress of organic reactions.So,the detection of water content in organic solvents is very important in the fields of chemistry,chemical industry,food safety,etc.In this thesis,we designed and synthesized a series of organic and organic-inorganic hybrid material probes.The main researches are as follows:1.Based on the previous research work,we further explored the influence of ligand structure changes on the synergistic coordination performance and sensing performance,and revealed the applicability of the mixed dual ligand strategy.By changing the structural characteristics of organic ligands,the response properties of a series of mixed dual ligand systems to metal ions were studied.The results exhibited that the DHAB-Mp Tpy system showed high selectivity to Co²⁺.After adding Co²⁺,the UV-vis absorption peak intensity at 538 nm and 395 nm showed a well linear relationship with the concentration of Co²⁺,accordingly the color of the solution changed from light yellow to pink.Therefore,DHAB-Mp Tpy system can be used as a colorimetric chemical probe for Co²⁺detection.2.We researched a H₂S colorimetric chemical probe based on1-（2-pyridinazo）-2-naphthol（PAN）and Zn²⁺ion composite system.PAN-Zn²⁺composite system showed high selectivity and sensitivity to H₂S.After the addition of H₂S,S^2-combined with Zn²⁺to form Zn S,which disintegrated the PAN-Zn²⁺composite system and released PAN,and the color of the solution changed from pink to yellow.The H₂S detection strategy in this study provided an idea and strategy for the subsequent construction of organic-inorganic hybrid material probes.3.In order to solve the problem that organic solvents are often used in the detection process due to the poor solubility of chemical probes,we prepared a magnetic organic-inorganic hybrid material MMPs@U67B@Zn based on the study of PAN-Zn²⁺composite system,and explored its fluorescence sensing of anions in aqueous solution.The results showed that MMPs@U67B@Zn was selective for H₂S,and the concentration of H₂S in aqueous solution could be quantitatively detected by the changes of fluorescence peak intensity at 470 nm.4.In many chemical reactions,the existence of water has the disadvantage of hindering the reaction process.In order to realize the detection of trace water content,TEA-SBA-15,an organic-inorganic hybrid material with good fluorescence performance was prepared.We explored the application of TEA-SBA-15 in the detection of water content in organic solvents,and researched the effect of structure changes on the spectral performance of the hybrid material.The results showed that TEA-SBA-15could quantitatively detect trace water in acetonitrile,ethanol,DMSO,methanol and THF.