Design,Synthesis And Application Of Stimuli-responsive Materials Based On Pt(Ⅱ) Complexes Phosphorescent Soft Salts

Luminescent materials have been widely used in display,data recording and storage,chemical sensing,bioimaging,which has attracted considerable attention in both scientific and industrial fields.It is of great significance to achieve tunable emission colors of luminescent materials for expanding their photonic applications.The traditional methods of the regulation of photophysical properties of luminescent materials are mainly limited to the modification of their chemical structure,such as the change of conjugated skeleton or the introduction of functional groups.However,this method requires complex and complicated synthesis and purification process.The tunable emission characteristics of the stimuli-responsive luminescent materials are sensitive to the external physical environmental changes such as light,temperature,force,and electric field.This feature makes it can be easily combined with the semiconductor technology in the current electronic devices.In recent years,transition metal complexes based phosphorescent soft salts,as a new type of luminsecent materials,have shown great potential application in different photoelectric fields,and significant progress has been made.Based on this,two Pt(Ⅱ)complexes based phosphorescent soft salts have been designed and synthesized.According to their unique properties of thermochromism,mechanochromism and vapochromism,the application of these complexes in optical anti-counterfeiting and securityprinting have been successfully realized.The main research contents are listed as follows:1.Phosphorescent soft salt based on Platinum(Ⅱ)complexes: photophysics,self-assembly,thermochromism,and anti-counterfeiting applicationThe cationic Pt(Ⅱ)complex C1 with 2-[4-(trifluoromethyl)phenyl]pyridine as the main ligand and ethylenediamine as the auxiliary ligand,and the anionic Pt(Ⅱ)complex A1 with4-(2-pyridyl)benzaldehyde as the main ligand and-CN as the auxiliary ligand were designed and synthesized.The phosphorescent soft salt S1 is successfully prepared by the simple salt decomposition reaction.The photophysical properties of soft salt S1 show the properties of one-dimensional nanostructures formed by self assembly and interesting photophysical changes under different solvent compostions.The emission color of the films will change significantly with the increase of temperature by doping S1 into PEG films at the appropriate concentration.According to its thermochromic properties,S1/PEG was used as security ink and the optical anti-counterfeiting application was successfully realized.Finally,based on the difference of fluorescence lifetime before and after heating,S1/PEG film was successfully applied to high-level anti-counterfeiting applications based on fluorescence lifetime imaging technology.2.Phosphorescent soft salt based on Platinum(Ⅱ)complexes: photophysics,self-assembly,mechanochromism,vapochromism,and sensing applicationThe cationic Pt(Ⅱ)complex C1 with 2-[4-(trifluoromethyl)phenyl]pyridine as the main ligand and ethylenediamine as the auxiliary ligand,and the anionic Pt(Ⅱ)complex A2 with2-(4-fluoro-3-(trifluoromethyl)-phenyl)pyridine as the main ligand and-CN as the auxiliary ligand were designed and synthesized.The phosphorescent soft salt S2 was successfully prepared by the simple salt decomposition reaction.The photophysical property changes of S2 were found associated with the self-assembly behavior.In addition,the soft salt S2 solid exhibits significant luminescence changes under the action of mechanical force,which can be recovered under the treatment of solvent vapor.Based on the response behavior of S2 to solvent vapor,its application in information recording was successfully realized.