3.1 Optimized geometries of the ground state

Eu(III) complexes with β-diketones were chosen among other Ln(III) coordination compounds for their intensive emission properties due to the high molar absorption coefficients of ligands and suitable positions of the excited levels of Eu(III) and ligands.[1-6]Ligand environment of Ln(III) complexes specifies their LC behavior and emission properties. In this work we selected objects with various substituted β-diketones and Lewis bases - Bpy17-17(5,5’­diheptadecyl-2,2’-bipyridine) and Phen (1,10­phenanthroline), see Figure 1.