Synthesis,Structures And Properties Of Coordination Complexes Based On Carboxylate And N-heterocycle Mixed-ligands System

With the development of coordination polymers(CPs)in photoelectromagnetic biosensing and catalysis,people have gradually realized that this kind of materials have good value and application prospects.So these CPs were favored by experts and scholars.In recent years,the researchers found that complexes as a new type of fluorescence sensors,which had excellent performance in detection of ions,explosives and small molecules with their simple,fast,selective,accurate,and cost-efficient real-time monitoring properties.Based on these application value,a series of complexes were constructed from halogenated dicarboxylic acid ligands,4-alkoxy benzoic acid and pyridinyl nitrogenous heterocyclic ring ligands complexed with transition metal ions,and their structures have been determined.The luminescent detection abilities of complexes were investigated,and the mechanism was analyzed in detail.In addition to this,the magnetic tests of three complexes were tested.The specific content of this paper is as follows.For one thing,there were nine complexes synthesized by H2BDC-Cl4,four different lengths of dipyridinyl heterocyclic ligands and transition metal ions.The aim was to research the effects of complexes' structures and abilities in regulating the length of nitrogen-containingly ligands.The structural changes of these complexes were analyzed,then according to the results,the luminescent detection experiments containing organic molecules,nitrobenzene,cations and anions had been carried out.It had been found that complex 6 had the best detection capability as a multifunctional fluorescence probe,and a detailed exploration of the detection mechanism had been made.For second thing,there were nine complexes were synthesized by H2BDC-Br4,5-H2Brp,three different lengths of dipyridinyl heterocyclic ligands and transition metal ions.According to their structural characteristics,the fluorescence selectivity experiments were carried out,and complex 14 had been found the best detection effect on S2-(KSV 2.35×105 M-1)and Fe3+(Ksv 1.40×105M-1).The order of magnitude reached 105 M-1.For the third thing,based on 4-pba,4-nbba,bpa,and bpp,we expected to adjust and control the crystals' structures,through changing the length of the ligands and the type of metal ions.Finally,five complexes were successfully synthesized.Complex 20 were investigated its potential application for sensing different types of small molecules,nitrobenzene,metal ions and anions.The fluorescence probe experiment of complex 20 was carried out,and the mechanism of complex 20 was analyzed.