In the Dissertation Council D.212.063.06 at Ivanovo State University of Chemistry and Technology on February, 2, 2009, post-graduate Valentin Sotsky, under the supervision of Prof. Usol’tseva Nadezhda V., successfully defended the thesis for a degree of candidate of chemical sciences (specialities: 02.00.04 – Physical chemistry and 02.00.01 – Inorganic chemistry): "Influence of the structure of iron (II) complexes with benzimidazole derivatives on their spin state change".