Synthesis And Properties Of Photochromic Compounds Based On Triarylamine And Terpyridyl Group

Since mankind enters the 21st century,information and communication technology and artificial intelligence level has made considerable development,therefore,the study of the molecular-level electronic devices by the widespread concern of scientists.The molecular switch for future logic and storage circuit structure unit,become one of research hotspots in the field of molecular electronic devices.In the field of molecular switch,the most promising one is the photochromic material,because of its simple synthesis,high resolving power and can be used repeatedly.But in many photochromic system,photochromic compound which contains dithiophenethene structural unit,generally have excellent thermal stability,fatigue resistance,as well as the advantages of fast response speed,therefore they are widely used in optical storage,optical memory material and the field of the optical switch.Therefore,design and synthesis of the structure novel,and function unique dithiophenethene compound has important significance.Currently,in order to construct the novel structure of the dithiophenethene compound,there are two commonly used means:one is to change the structure of which containing ethylene units and as a bridge;another method is to change the molecular structure of the groups on both sides or an appropriate modification is enough.The triphenylamine and terpyridine group are two common fluorescent chromospheres,can emission specific fluorescence under UV irradiation respectively;and they are strong Lewis base,can combination with a Lewis acid well;and terpyridine group is a good metal ligand,can ligands with a variety of metals.In this article we use dithiophenecyclopentene unit as the parent,and use optical performance triphenylamine and terpyridine as a building block,were unilateral,bilateral and one side triphenylamine one side terpyridine synthesis of a series of photochromic compounds,and terpyridine group containing compound with europium complexes to synthesize novel photochromic system.The detailed contents are depicted as follows:1.The design and synthesis of a series of photochromic compounds which contain dithiophenethylene structural unit,triphenylamine group and terpyridine group,and use UV-Vis absorption spectra and fluorescence emission spectra study their photochromic properties.The results showed that the target compounds showed good photochromic properties.Moreover when added trifluoroacetic acid and triethylamine alternately,the target compounds showed the good acid chromic and photochromic properties.2.The design and synthesis of a series of novel photochromic compounds containing terpyridine groups,and ligands with europium complexes,and use UV-Vis absorption spectra and fluorescence emission spectra study their photochromic properties.The results showed that such metal complexes have good photochromic properties and fluorescence switching action,which provide a new method for the design of novel photochromic fluorescence switch.