Synthesis, Photo- and Electroluminescence of New Polyfluorene Copolymers Containing Dicyanostilbene and 9,10-Dicyanophenanthrene in the Main Chain

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.

Structural data of phenanthrene-9,10-dicarbonitriles

In this data article, we present the single-crystal XRD data of phenanthrene-9,10-dicarbonitriles. Detailed structure analysis and photophysical properties were discussed in our previous study, “Intermolecular interactions-photophysical properties relationships in phenanthrene-9,10-dicarbonitrile assemblies” (Afanasenko et al., 2020). The data include the intra- and intermolecular bond lengths and angles.

Halogen and hydrogen bonding in cis-dichlorobis(propionitrile)platinum(II) chloroform monosolvate

The weak intermolecular noncovalent interactions in the solvate cis-[PtCl2(C2H5CN)2]·CHCl3 were 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 of cis-[PtCl2(C2H5CN)2] (Hchloroform–Clcomplex (2.660 Å, 2.811 Å)), and on the other side, the weak Clchloroform–Clcomplex (3.247 and 3.497 Å) interactions were found. According to DFT calculation, only the Hchloroform–Clcomplex (2.660 and 2.811 Å) and Clchloroform–Clcomplex (3.247 Å) interactions can be classified as weak noncovalent bonds, whereas the contacts Clchloroform–Cnitrile (3.391 Å) and Clchloroform–Clcomplex (3.497 Å) are due to the crystal packing effect.