Grigory A. Kim

Synthesis of unsymmetric 6,6´-diaryl-2,2´-bipyridines using a 1,2,4-triazine methodology

New unsymmetric 6,6´-diaryl-2,2´-bipyridines were synthesized in high yields using a “1,2,4-triazine” methodology. Their photophysical properties were studied.

Preparation of 5,6´-diaryl-2,2´-bipyridines using a 1,2,4-triazine methodology

New unsymmetric 5,6´-diaryl-2,2´-bipyridines were synthesized in high yields using a 1,2,4-triazine methodology. Their photophysical properties were studied.

A new synthetic approach to fused nine-ring systems of the indolo[3,2-b]carbazole family through double Pd-catalyzed intramolecular C–H arylation

A series of new polycyclic compounds bearing the 5,11-dihydroindolo[3,2-b]carbazole ring system, as the common motif of their nine-ring scaffolds, has been successfully prepared with the usage of an efficient two-step strategy, based on the double Friedel–Crafts acylation of 5,11-dihexyl-6,12-di(hetero)aryl-substituted 5,11-dihydroindolo[3,2-b]carbazoles with 2-iodobenzoyl chloride in the presence of SnCl4, followed by regioselective palladium-catalyzed cyclization of the obtained 2,8-bis(2-iodobenzoyl) derivatives into the desired fused 9H-fluoren-9-ones. Some modifications of these nine-ring structures have been performed to afford compounds of the same family bearing the 9H-fluorene fragments. Basic photophysical and electrochemical properties as well as thermal stability of the new fused indolo[3,2-b]carbazole derivatives have been determined.

Dinuclear Lanthanide-Lithium Complexes Based on Fluorinated β-Diketonate with Acetal Group: Magnetism and Effect of Crystal Packing on Mechanoluminescence

The synthesis of novel dinuclear lanthanide complexes with formulas [(LnL3)(LiL)(MeOH)] (1–3) and [(LnL3)(LiL)(H2O)] (4–6) (Ln = Eu(III), Tb(III), Dy(III)) based on functionalized lithium β-diketonate (LiL) is reported. The coordination environment of the Ln(III) ion is formed by oxygen atoms of both the 1,3-dicarbonyl moiety and the acetal group. Depending on the solvent used for the crystallization, methanol or water molecules participate in the coordination with Li(I) ions affecting the crystal structure of complexes. In contrast to [(LnL3)(LiL)(H2O)] 4–6, a series of complexes [(LnL3)(LiL)(MeOH)] 1–3 showed mechanoluminescence properties, thereby demonstrating the relationship between the observed optical properties and crystal packing architecture. The magnetic measurements of [(LnL3)(LiL)(MeOH)] 1–3 revealed SMM behavior of [(DyL3)(LiL)(MeOH)] 3 at low temperatures (Ueff is 37.7 cm−1).