Self Assembly And Properties Of Photochromic Materials Derived From Perylene Imide

Light connects energy and information in a special way.Photochromic materials have great potential for applications,such as molecular switches,light control materials,optical modes,information storage and so on.In this paper,we designed and synthesized perylene imide photochromic materials,and studied their photochromic properties;Based on the self-assembly of perylene imide,the dynamic self-assembly behavior of perylene imide was studied1.Salicylhydrazide was modified to the imide site of typical n-type organic semiconductor perylene diimide(PDI).The target product was characterized by NMR,IR and Ms.One perylene diimide fluorophore and two perylene d iimide(PDISH)with symmetrical salicylhydrazide units were obtained.2.The photochromic properties of different states were studied in detail.The results showed that under 365 nm UV irradiation,PDISH compound in DMF solution showed a"reverse"light controllable color change,and the color of the solution showed a phenomenon of gradual fading and fluorescence quenching from pink,which could be recycled for more than five times,and the solution recovered after heating;In the film state,the mask can p rint out the shape and the state is stable,which has potential applications in inkless printing.3.The self-assembly of PDISH in two-phase systems(CH₃OH/DMF,H₂O/DMF)was studied by rapid solvent diffusion method.The morphology and photophysical properties of the aggregates show that the significant morphological transition from nanospheres to microrods is achieved,which allows the fluorescent groups to be used to monitor and visualize the aggregation process.More interestingly,in the presence of copper ions,the intramolecular hydrogen bonds of the compounds are destroyed,resulting in the structural rearrangement.Therefore,the PDISH has a potential application prospect in the detection of copper ions.To sum up,a photochromic PDI derivative was s ynthesized by a simple method,which has the properties of photochromism,self-assembled morphological transformation and copper ion detection.At the same time,a new method for the structure and application of photochromic compounds was proposed.Therefo re,PDISH is a multifunctional organic light-emitting material with excellent photochromic,self-assembly and ion probe properties.