Heteroleptic (2-Fluoro-3-pyridyl)arylborinic 8‑Oxyquinolinates for the Potential Application in Organic Light-Emitting Devices

A one-pot protocol has been developed
to obtain a series of luminescent heteroleptic diarylborinic complexes
bearing the 2-fluoro-3-pyridyl and another aryl group attached to
the boron atom chelated with a simple or functionalized 8-oxyquinolinato
ligand. The tetrahedral geometry around the boron atom in all compounds
has been established by the 11B NMR spectroscopy and/or
X-ray diffraction technique. In the solution, the obtained complexes
have emission maxima ranging from 502 to 525 nm at room temperature.
The quantum yield of emission significantly depends on the type and
position of the substituents in the 8-oxyquinolinato ligands and aryl
rings. An interpretation of the experimental UV–vis absorption
and emission spectral data is supported by theoretical calculations
of the frontier molecular orbitals. Marcus theory was used to theoretically
evaluate charge-transport properties of the obtained complexes.