Seong-Jae Yun

Blue phosphorescent iridium(III) complexes containing carbazole-functionalized phenylpyridine for organic light-emitting diodes: energy transfer from carbazolyl moieties to iridium(III) cores

By introducing a hexylcarbazolyl substituent into a phenylpyridine-based ligand, a Forster energy transfer from the carbazole moieties to the Ir(III) cores was observed in the heteroleptic cyclometalated Ir(III) complexes, resulting in an enhancement of luminescent efficiency. The phosphorescent OLED gave CIE coordinates of (0.21, 0.55) with a maximum external quantum efficiency of 7.16%.

Di-μ-chlorido-bis­{[2-(benzyl­imino­meth­yl)pyridine-κ2 N,N′]chloridomercury(II)} dichloridomercury(II)

The HgII ion in the title centrosymmetric dinuclear complex, [Hg2Cl4(C13H12N2)2]·[HgCl2], adopts a distorted square-pyramidal geometry, being coordinated by the bis-chelating N-heterocyclic ligand, two bridging Cl atoms and one terminal Cl atom. One of the bridging Hg—Cl bonds [2.8428 (11) Å] is significantly longer than the other [2.5327 (10) Å]. In the crystal, there are weak π–π interactions [centroid–centroid distance = 3.630 (3) Å] between the aromatic rings of the discrete units. The HgCl2 adduct molecule is located on an inversion centre and has an Hg—Cl bond length of 2.2875 (11) Å.

Bis[2-(1,3-benzo­thia­zol-2-yl)phenyl-κ2C1,N][1,3-bis­(4-bromo­phen­yl)propane-1,3-dionato-κ2O,O′]iridium(III)

The title complex, [Ir(C15H9Br2O2)(C13H8NS)2], lies about a crystallographic twofold rotation axis passing through the IrIII atom and the central C atom of the bis(bromophenyl)propane-1,3-dionate ligand. The IrIII atom adopts a distorted octahedral geometry coordinated by two N atoms in the axial positions, and two C and two O atoms in the equatorial plane. The dihedral angle between the two thiazole ring systems in the complex is 77.45 (10)°.

Bis[3,5-difluoro-2-(4-methyl­pyridin-2-yl)phenyl-κ2C1,N](picolinato-κ2N,O)iridium(III) chloro­form monosolvate

In the title complex, [Ir(C12H8F2N)2(C6H4NO2)]·CHCl3, two similar molecules of each component comprise the asymmetric unit. The independent complex molecules are linked by intermolecular π–π interactions [centroid–centroid distance = 3.830 (4) Å]. The IrIII ion adopts a distorted octahedral geometry, being coordinated by three N atoms, two C atoms, and one O atom of three bidentate ligands, with the N atoms arranged meridionally.