Recently, Professor Liu Tao of the State Key Laboratory of Fine Chemicals successfully used the laser to realize the reversible manipulation of magnetic dipole vector, electric dipole vector, expansion behavior, and fluorescence emission behavior, which is to further realize the steady state material of light regulation molecules. Functionalization and deviceization provide the foundation.
The photoresponsive molecular material can be reversibly switched between two or more states under different wavelengths of green laser pointer light, resulting in changes in physical and chemical properties such as material color, shape, magnetism, conductivity, etc., thereby enabling molecular switching and sensing. And high-density memory devices and other fields have broad application prospects, and in recent years have been widely concerned by researchers in the fields of energy, catalysis, and multifunctional materials.
However, current green laser pointer photoresponsive materials, especially organic molecular materials, often involve chemical bond changes or group rotation at the molecular structure level, limited by steric hindrance, and usually can only be efficiently converted in solution, how to achieve in solid state. Fast reversible control of various functions is an important challenge in the development of solid state light response molecular devices. Electron migration or rearrangement of photoinduced metal ions can regulate material properties at the electronic structure level and perform highly efficient and reversible transformation in the solid state, providing a way to achieve multifunctional control of solid molecular switching materials.
The group deeply studied the relationship between photoinduced electron mobility rearrangement and material multi-functional coupling, and proposed to control the magnetic, electrical, thermal expansion and the changes of spin, charge, bond length and absorption spectrum caused by electron migration and rearrangement. Optical properties, etc.
Meng Yinshan, a young teacher of Professor Liu Tao’s research group, designed and constructed a rare earth magnetic bistable molecule by considering the electronic structure characteristics of rare earth elements. It can maintain the magnetization state at the molecular scale, and can control the magnetic dipole orientation by using the external magnetic field to realize the switching between magnetic bistable states. At the same time, the positively charged FeII spin-transformation element is connected with the negatively charged building element to construct a one-dimensional chain, and the electronic structure of the material is realized by laser-induced spin-electron rearrangement and charge redistribution to realize magnetic and dielectric properties. The synergistic response of the function to external stimuli provides a means to track the magnetic state using electrical measurements.