The weak intermolecular noncovalent interactions in the solvatecis-[PtCl₂(C₂H₅CN)₂]·CHCl₃were studied by XRD and DFT methods. Special attention was paid to a chloroform molecule as a potential donor of both hydrogen and halogen bonds. On the one hand, the H atom of chloroform links two Cl atoms ofcis-[PtCl₂(C₂H₅CN)₂] (H_chloroform–Cl_complex(2.660 Å, 2.811 Å)), and on the other side, the weak Cl_chloroform–Cl_complex(3.247 and 3.497 Å) interactions were found. According to DFT calculation, only the H_chloroform–Cl_complex(2.660 and 2.811 Å) and Cl_chloroform–Cl_complex(3.247 Å) interactions can be classified as weak noncovalent bonds, whereas the contacts Cl_chloroform–C_nitrile(3.391 Å) and Cl_chloroform–Cl_complex(3.497 Å) are due to the crystal packing effect.

Using palladium-catalyzed Suzuki polycondensation, we synthesized new light-emitting fluorene copolymers containing the dicyano derivatives of stilbene and phenanthrene and characterized them by gel permeation chromatography, UV-vis absorption spectroscopy, spectrofluorimetry, and cyclic voltammetry. The photoluminescence spectra of the synthesized polymers show significant energy transfer from the fluorene segments to the dicyanostilbene and 9,10-dicyanophenanthrene units, which is in agreement with the data of theoretical calculations. OLEDs based on these polymers were fabricated with an ITO/PEDOT-PSS (35 nm)/p-TPD (30 nm)/PVK (5 nm)/light emitting layer (70–75 nm)/PF-PO (20 nm)/LiF (1 nm)/Al (80 nm) configuration. Examination of their electroluminescence revealed that copolymers of fluorene with dicyanostilbene show yellow-green luminescence, while polymers with 9,10-dicyanophenanthrene have a greenish-blue emission. The 9,10-dicyanophenanthrene units have a more rigid structure compared to dicyanostilbene and, in OLEDs based on them, an increase in maximum brightness is observed with an increase in the content of the additive to the polymer chain. In particular, the device using fluorene copolymer with 9,10-dicyanophenanthrene (2.5 mol%) exhibited a maximum brightness of 9230 cd/m² and a maximum current efficiency of 3.33 cd/A.