Synthesis And Properties Of Molecular Switch And Molecular Wire Compounds Based On Triarylamine

As the size of electronic equipment and devices have become smaller and smaller,the devices based on the molecular level have aroused extensive attentions.At present,researchers have designed,synthesized and measured various molecular electronic devices such as molecular wires,molecular switches,molecular memory,and molecular rectifiers.Among them,molecular wire is the core unit of molecular electronic devices,as well as the indispensable primary element to achieve complete molecular circuit.Molecular wires have been given a very broad application prospects for their advantages,such as small size,adjustable performance,variety.As the future structural unit of logic and memory circuits,molecular switch has become a hot topic in the field of molecular electronic devices.Triarylamine compound is a kind of important organic molecule,due to its own advantages,such as high hole mobility,low ionization potential,better electron-donating and stability.They have a wide range of applications in the chemical dyes,pharmaceutical intermediates,especially in organic optoelectronic materials aspects.In this paper,we introduced the dithienylethenes structure which have excellent photochromic properties and redox-active metal ruthenium unit to triarylamine system.According to the literature,we know that dithienylethenes compounds expressed excellent photochromic properties;ruthenium unit is a kind of good redox end groups for its good redox properties;and triarylamine not only can be used as bridging ligands,but also as redox-active end group.So we combined these three parts to designe and synthesize a series of molecular switches and molecular wires compounds containing triarylamine unit.Details are as follows:1.We introduced the triarylamine into dithienylethenes skeleton,then designed and synthesized a series of dithienylethenes molecule switch compounds containing triarylamine unit.Then we used UV-Vis absorption spectra to research their photochromic properties,and used cyclic voltammetry and UV-vis-NIR spectro-electrochemistry to study their electrochemical and spectroscopic properties.The results showed that the target compounds displayed good photochromic properties and electrochromic properties,which indicated that they can be used as multiple response switch materials.2.We introduced the triarylamine into molecular wire,then designed and synthesized a series of molecular wire compounds containing triarylamine structural units,in which triarylamine units are used as bridging ligands,metal ruthenium complexes or triarylamine are used as redox-active terminal groups.The electronic properties of these complexes were investigated by cyclic voltammetry,square wave voltammetry,IR and UV-vis-NIR spectroelectrochemistry.The results suggestted that these compounds all showed a one-electron multi-step oxidation process.