ИСТИНА

Heteroscorpionate ligands have been demonstrated as attractive ancillary ligands for the synthesis of transition metal complexes. Their reactions with Ni(II) salts can, in principle, give half-sandwich (structure B, kinetic control) or full-sandwich (structure C, thermodynamic control) complexes through the tripodal coordination of one or two scorpionates via the pyrazolyl ring’s nitrogen atom. The coordinatively saturated complexes C showed a very moderate activity in alkene oligomerization reactions. The selective synthesis of coordination compounds type B – is a challenging task. To overcome these problems various synthetic approaches were used, including slow addition of the ligand solution to the solution of the starting nickel complex, an exception to prolonged heating of the reaction mixture or the use of rather exotic metal sources, such as tetrahalonickelate(II) ion in nitromethane. In this paper, for the stabilization the half -sandwich complexes were applied a tetradentate heteroscorpionate ligand, synthesized by Peterson rearrangement from 8- methoxyquinoline-2-carboxaldexyde and bis(3,5-dimethylpyrazolyl)methanone.