摘要 :
Aggregation-induced emission luminogens(AIEgens)are a class of compounds that exhibit strong fluorescence emission in an aggregate or solid state.It has attracted significant attention for its applications in optoelectronic device...
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Aggregation-induced emission luminogens(AIEgens)are a class of compounds that exhibit strong fluorescence emission in an aggregate or solid state.It has attracted significant attention for its applications in optoelectronic devices,detection,sensing,and bioimaging displays.Additionally,AIEgens compounds can aggregate upon coordination with metal ions,resulting in metal ion sensors.The AIEgens sensors can be optimized by designing its RIM function based on the analytes.The key challenge in this field is to improve the sensitivity to metal ions based on coordination polymerization-induced emission(CPIE)by using ligands with multiple binding sites.The Schiff base AIEgen with a multi-binding site was constructed in this thesis with the goal of sensing Zn2+based on CPIE.During the sensing of Zn2+,the rotation and motion of Schiff base unit were restricted by both molecular aggregation and coordination bonds,thus reducing the non-radiative decay.The main research results are as follows:
(1)An AIEgen chemosensor of H2hbih,[(E)-N-(2-hydroxybenzylidene)isonicotinohydrazide],containing an isonicotinic moiety condensated by salicylaldehyde was prepared and characterized.It can detect Zn2+ ions selectively in the "off-on" mode based on the CPIE,with the limit of detection(LOD)being 2.8×10-7 M.The mechanistic investigations revealed that a 2D coordination polymer of Zn2+complex(1)was formed.In addition,H2hbih can be successfully applied to bioimaging of Zn2+monitoring in mung beans,larval zebrafish,and inner epidermis cells.
(2)Cadmium complex[Cd(H2hbih)2(NO3)2(H2O)2](2)was obtained by the reaction of H2hbih and cadmium nitrate.Cd2+ cannot interfere with Zn2+sensing,as demonstrated by a molecular Cd2+ complex(2)without CPIE.The crystal form of complex 2 does favor RIM to enhance strong yellow emission.However,when exposed to base/acid vapor in solid form,it exhibited turn-on-off fluorescence and color changes.Furthermore,it was used as a sensor for sensing amine vapors from food spoilage.
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