The rational choice of ligands and design of complexes allows to obtain new compounds that are able to undergo transition between the low-spin and the high-spin states under the influence of various external factors such as temperature or pressure, effect of guest molecules, light irradiation or magnetic field.
Introduction of a chiral anion to a framework allows to obtain chiral spin-crossover materials that are characterized by switchable circular dichroism and can be potentially integrated into various photonic devices operating in UV and visible regions.
Along with electronic reconfiguration spin transition is accompanied by a drastic change of all physical properties including the ability to absorb microwave radiation. This allows to develop efficient microwave switches that are based on spin-crossover materials.
The spin state of the Fe(II) centres plays a crucial role in determining redox catalytic activity. We have already found that low-spin species are characterized by higher reaction rates and smaller activation energies compared to high-spin analogues.
Spin-crossover materials are perspective for a huge variety of applications, such as molecular switching, sensing, thermal control etc. Additionally, the size effect on spin-crossover characteristics is intensively studied.
Spin-crossover complexes are very sensitive to the inclusion of guest molecules. Upon absorption of different optical isomers of chiral guest molecules, the stereoselective shift of the spin transition temperature is observed.