Synthesis, Recognition Properties And Application Of Schiff Base And Hydrazone Chemosensors

With the rapid development of industrial property, the problem of environment became more and more critical, especially the pollution of heavy metal cations and toxic ions. Therefore, the study of recognizing these anions has also take more attention of scientists from all areas. And the chemosensor has attracted more attention of chemists because of its simple structure, the quick, easy and sensitive detection of ions.The synthesis and properties of Schiff-base and hydrazones anions chemosensor has been researched in this thesis. There are three sections in this thesis.In the section one, the background knowledge and research significance of ions recognition have been introduced briefly.(i) The importance of copper ions detection and the research status and progress of ultraviolet and fluorescence detection methods.(ii) The detection significance and research status and progress of Dihydrogen phosphate ions.(iii) And the harm of cyanogen and methods of its recognition in the latest research status and progress have been introduced.In the section two, a novel kind of double Schiff base chemosensor(T) has been synthesized through combining N,N-Diethylsalicylaldehyde with 1,5-Naphthalenediamine. Its characters have been tested by UV-vis spectrometry and fluorescence spectroscopy after adding Hg2+, Ag+, Ca2+, Cu2+, Co2+, Ni2+, Cd2+, Pb2+, Zn2+, Cr3+and Mg2+cations into its solution. It can detect Cu2+ in DMSO/H2 O aqueous(v/v=9:1, HEPES, p H = 7.2) buffered solution through UV-vis and fluorescence channels. In addition, it can also identified Cu2+ with the naked eye. In order to detect Cu2+ conveniently and quickly, the test strips have also been made. At the same time, the T-Cu2+ was used as a new chemosensor and its characters was tested when adding F-, Cl-, Br-, I-, Ac O-, H2PO4-, HSO4-, Cl O4-, CN- and SCN- ions into its solution. It performed a good recognition of detecting H2PO4- successively through UV-vis and fluorescence channels. And it can also identify H2PO4- with the naked eye.In the section three, 2-Hydroxy-1-naphthaldehyde and Phenylhydrazine-4-sulfonic Acid Hemihydrate was used as raw materials synthesized a hydrazone compound(X). Through characters testing experiment, we found that it can detect CN- ions through UV-vis and fluorescence channels selectively, when adding different kinds of ions into its DMSO/H2O(v/v=1:4) aqueous. In addition, it can identified CN- with the naked eye under the UV lamp. In order to detect CNconveniently and quickly, the test strips have also been made.All in all,those chemosensors can be used to detect Cu2+, H2PO4- and CNselectively and sensitively. And the characters of them made us believe that these fluorescence chemosensors have potential application in biological and environmental areas.