Wide Bite Angle Disphosphine Ligands in Thermally Activated Delayed Fluorescent Copper(I) Complexes: Impact on the Performance of Electroluminescence Applications

<p>We report a series of seven cationic heteroleptic copper(I) complexes of the form [Cu (P^P) (dmphen)]BF₄, where dmphen is 2,9-dimethyl-1,10-phenanthroline and P^P is a diphosphine chelate, in which the effect of the bite angle of the diphosphine ligand on the photophysical properties of the complexes was studied. Several of the complexes exhibit moderately high photoluminescence quantum yields in the solid-state, with Φ_PL of up to 35%, and in solution, with Φ_PL of up to 98%. We were able to correlate the powder photoluminescence quantum yields with the %V_bur of the P^P ligand. The most emissive complexes were used to fabricate both organic light-emitting diodes (OLEDs) and light-emitting electrochemical calls (LECs), both of which showed moderate performance. Compared to the benchmark Cu(I)-based LECs, [Cu(dnbp)(DPEPhos)]⁺(EQE_max = 16%), complex <b>3</b> (EQE_max = 1.85%) showed much longer device lifetime (t_1/2= 1.25 h and >16.5 h for [Cu(dnbp)(DPEPhos)]⁺ and complex <b>3</b>, respectively). The electrochemiluminescent properties of several complexes were also studied which to the best of our knowledge constitutes the first ECL study for heteroleptic copper (I) complexes. Notably, complexes exhibiting more reversible electrochemistry were associated with higher annihilation ECL as well as better performance in an LEC device.</p>

Wide Bite Angle Disphosphine Ligands in Thermally Activated Delayed Fluorescent Copper(I) Complexes: Impact on the Performance of Electroluminescence Applications

<p>We report a series of seven cationic heteroleptic copper(I) complexes of the form [Cu (P^P) (dmphen)]BF₄, where dmphen is 2,9-dimethyl-1,10-phenanthroline and P^P is a diphosphine chelate, in which the effect of the bite angle of the diphosphine ligand on the photophysical properties of the complexes was studied. Several of the complexes exhibit moderately high photoluminescence quantum yields in the solid-state, with Φ_PL of up to 35%, and in solution, with Φ_PL of up to 98%. We were able to correlate the powder photoluminescence quantum yields with the %V_bur of the P^P ligand. The most emissive complexes were used to fabricate both organic light-emitting diodes (OLEDs) and light-emitting electrochemical calls (LECs), both of which showed moderate performance. Compared to the benchmark Cu(I)-based LECs, [Cu(dnbp)(DPEPhos)]⁺(EQE_max = 16%), complex <b>3</b> (EQE_max = 1.85%) showed much longer device lifetime (t_1/2= 1.25 h and >16.5 h for [Cu(dnbp)(DPEPhos)]⁺ and complex <b>3</b>, respectively). The electrochemiluminescent properties of several complexes were also studied which to the best of our knowledge constitutes the first ECL study for heteroleptic copper (I) complexes. Notably, complexes exhibiting more reversible electrochemistry were associated with higher annihilation ECL as well as better performance in an LEC device.</p>

A series of luminescence Cu(I) complexes based on diphosphine ligand and diimine ligand: the weak intermolecular interactions, terahertz spectra and photoproperties

Five novel mononuclear [Cu(Bphen)(bdppmapy)]X complexes showing photoluminescence were synthesized. The same diphosphine ligand and diimine ligand and different Cu(I) salts were used in the one-pot synthesis of complexes 1-5. These...

Decarbonylative Synthesis of Aryl Nitriles from Aromatic Esters and Organocyanides by a Nickel Catalyst

A decarbonylative cyanation of aromatic esters with aminoacetonitriles in the presence of a nickel catalyst was developed. The key to this reaction was the use of a thiophene-based diphosphine ligand, dcypt, permitting the synthesis of aryl nitrile without the generation of stoichiometric metal- or halogen-containing chemical wastes. A wide range of aromatic esters, including hetarenes and pharmaceutical molecules, can be converted into aryl nitriles.

Aqueous Suzuki–Miyaura Coupling with Ultralow Palladium Loading and Simple Product Separation

The diphosphine ligand N,N-bis(diphenylphosphanylmethyl)-aniline (bdppma) and PdCl2 afforded a Suzuki–Miyaura catalyst [(bdppma­)PdCl2] that was highly efficient at an ultralow catalyst loading (0.001 mol%) in 20:1 H2O–EtOH. This low catalyst loading in an aqueous solvent system permitted simple product separation by direct filtration without the need for chromatography. The ligand bdppma imparted surprisingly better reactivity than that achieved with other bidentate diphosphine ligands, but the catalytic system had a slightly narrower substrate scope than some similar Pd catalysts reported previously.

Platinum complexes of a boron-rich diphosphine ligand

Herein, we describe the preparation, characterization, and reactivity of two PtII bis-hydrocarbyl complexes containing the 1,2-bis(di(3-dicyclohexylboraneyl)propylphosphino)ethane (P2BCy4) ligand.