C–X⋯Cl–Pt Halogen bonds and πh⋯d_z2[Pt^II] contacts led to the 2-fold increase of phosphorescence quantum yields for [cyclometalated]-Pt^II(isocyanide) complexes upon co-crystallisation with halosubstituted perfluorinated arenes.

A novel series of cyclometalated platinum(II) complexes bearing acyclic diaminocarbene (ADC) ancillary ligands were designed and prepared. Their photophysical properties were systematically studied through experimental and theoretical investigations. All complexes exhibit green phosphorescence with a quantum efficiency of up to 45% in 2 wt% doped PMMA film at room temperature. The complexes are used as light-emitting dopants for organic light-emitting diode (OLED) fabrication. The devices displayed a green emission with a maximum current efficiency of 2.9 cd A⁻¹ and a luminance of 2700 cd m⁻². These results show that these cyclometalated platinum(II) complexes can be used as efficient green emitting components of OLED devices.

Phosphine isocyanide complexes cis-[PtCl2(CNMes)(P)] with mesitylisocyanide and phoshine ligands were synthesized in yields of 92‒98%. The products were characterized by mass spectrometry, IR and 1H...

A series of cyclometalated platinum(II) complexes with nitrile and isocyanide ligands (RCN and RNC; R = t-Bu, Bn, Ph) have been synthesized in 60–80% yields from the dimer [{Pt(ppy)Cl}₂] (Hppy is 2-phenylpyridine) and the corresponding nitriles and isocyanides. The structure of the synthesized complexes was determined by mass spectrometry, IR and NMR spectroscopy, and X-ray diffraction. The contributions of different intermolecular interactions to the crystal packing were estimated by Hirshfeld surface analysis. Photophysical properties of the synthesized complexes in solution and solid state were studied.

New cyclometalated dinuclear platinum(II) complex bearing bridged 4,6-dimethylpyrimidine-2(1H)-thiolate (μ-C₆H₇N₂S-κN,S) ligands, [{Pt(ppy)(μ-C₆H₇N₂S-κN,S)}₂] (3) (ppy=(2-phenylpyridinato-C²,N)) was prepared via the reaction of chloro-bridged dimer [{Pt(ppy)Cl}₂] with 4,6-dimethylpyrimidine-2(1H)-thione (C₆H₈N₂S) in the presence oft-BuOK. The complex holds dinuclear frameworks with short Pt(II)···Pt(II) distance (2.8877(3) Å), and exhibit red intense luminescence from the triplet metal-metal-to-ligand charge-transfer at 697 nm in CH₂Cl₂solution and at 649 nm in solid state at RT. Single crystal XRD analysis reveals the metallophilic interactions Pt···Pt with significant covalent contribution in the structure of3which were studied by quasi-relativistic and relativistic DFT calculations (viz., M06/MWB60(Pt) and 6-311+G* (other atoms); M06/DZP-DKH levels of theory) and topological analysis of the electron density distribution within the framework of Bader’s theory (QTAIM method). Estimated strength of the Pt···Pt contact is 8.1–12.2 kcal/mol and it is mostly determined by crystal packing effects and weak attractive interactions between the adjacent metal centers due to overlapping of their d_z2and p_zorbitals. An organic light-emitting diode based on this complex showed red electroluminescence with maximal luminance of 115 cd/m²and current efficiency of 2.45 cd/A at this luminance.