Spin transition (ST) phenomenon presents a new class magnetic materials

with interesting property ##bistability. Bistability of ST material is type of

functionality based on the crossover between the low spin and high spin state

and is accompanied by many changes of physical properties. The conversion

of spin can be turned on by external trigger like temperature, presure or by

magnetic field as well as the light excitation. From the aplication point of view,

such bistability of material which depends only on the external conditions, is

very atractive in many fields of technology. The most promising applications

are based on the change of magnetic moment (data storage devices, contrast

agents for MRI), or on the thermochromism (displays technologies) of ST

material. However, the ST of suitable material for technology has to follow

some requirements like abruptness, room temperature hysteresis loop or

stability of material. With respect to this, iron(II) complexes with N-donor

ligands are able to fulfill all mentioned requests and very often one can found

abrupt ST placed into room temperature region, which is accompanied with

hysteresis effect. The project with title “Spin transition in Iron(II) complexes

with N-donor ligands” includes laboratory synthesis of N-donor ligands, iron(II)

ST complexes, their investigation of magnetic and other physical properties.

The main goal of project is to find the way how to prepare technologicaly

applicable ST iron(II) complexes.