[en] The authors have demonstrated a highly efficient and stable phosphorescent white organic light-emitting diode (WOLED), which has been achieved by doping only one orange phosphorescent emitter, Bis(5-benzoyl-2-(4-fluorophenyl)pyridinato-C,N)iridium(III) acetylacetonate into an appropriate deep blue phosphorescent host, 4,4'-bis(4-(triphenylsilyl)phenyl)-1,1'-binaphthyl as an emitting layer (EML). The WOLED has been achieved by effective confinement of triplet excitons to emit a warm white color. The optimized WOLED, with a simple structure as a hole transporting layer-EML-electron transporting layer, showed a maximum luminous efficiency of 22.38 cd/A, a maximum power efficiency of 12.01 lm/W, a maximum external quantum efficiency of 7.32%, and CIEx,y coordinates of (0.38,0.42) at 500 cd/m², respectively. - Highlights: • Highly efficient phosphorescent white organic light-emitting diode (WOLED) • Single emitting layer consists of synthesized deep blue host and orange emitter • The WOLED with high EL efficiencies due to efficient triplet exciton confinement

No abstract available

[en] Quadrupolar interactions in [Ir(CN)₅]^3-, [Ir(CN)₅Cl]^4- and [Ir(CN)₄Cl₂]^4- paramagnetic complexes in alkali halide host lattices are systematically analysed by ESR spectroscopy. The measured quadrupolar interactions are shown to have no clear correlation to the measured unpaired electron populations

[en] We have experimentally investigated the effects of pressure on the magnetoelastic transitions associated with the opening of spin-gaps in Ba₃BiIr₂O₉ and Ba₃BiRu₂O₉. For both compounds, reducing the unit cell volume by either external physical and internal chemical pressure was found to reduce the temperature T^* of the transition and, to a lesser extent, the magnitude of the associated negative thermal volume expansion. The results yield the latent heat associated with the transitions, −3.34(3) × 10² J mol⁻¹ for Ba₃BiIr₂O₉ and −7.1(5) × 10² J mol⁻¹ for Ba₃BiRu₂O₉. The transition in Ba₃BiRu₂O₉ is significantly more robust than in Ba₃BiIr₂O₉, requiring an order of magnitude higher pressures to achieve the same reduction in T^*. The differing responses of the two compounds points to differences between the 4d and 5d metals and hence to the importance of spin-orbit coupling, which is expected to be much stronger in the Ir compound. (paper)

[en] Ir(IV)Clsub(6)sup(=) ions have been reduced to Ir₀ using the reductive species produced by radiolysis of solvent water or ammonia. Ir(IV) ions were either homogeneously dissolved or alumina supported. Radiation reduced Ir₀ is shown to be constituted of very small particles which are characterized by UV.VIS spectra and electron micrographs. Their catalytic efficiency has been evaluated by two techniques: (a) colloidal suspension in water has been tested for hydrogenation of nitrobenzene; (b) alumina-deposited metal has been tested for hydrazine decomposition in a pilot thruster for satellites. Radiolytic reduction reveals itself to be an efficient and general method for preparing highly divided noble metals

[en] Deuterium exchange labelling using [Ir(COD)(Cy₃P)(Py)]PF₆ as catalyst and deuterium gas was studied on a number of substituted acetanilides. In most cases products containing deuterium ortho to the anilide group were obtained with a high degree of enrichment. With one exception no evidence for meta, para or anilide methyl labelling was seen. The catalyst was also effective in the ortho deuteration of acetophenone, benzophenone and the β-lactam containing compound Sch 48461. (Author)

[en] Published in summary form only

[en] The iridium(I) cyclooctadiene complex with two (3-tert-butylimidazol-2-ylidene) ligands [(H-Im"tBu)_2Ir(COD)]"+PF_6"− (C_2_2H_3_2PF_6IrN_4) has been prepared, and its crystal structure is determined by X-ray diffraction. Complex exhibits slightly distorted square planar configurations around the metal atom, which is coordinated by two H-Im"tBu ligands and one cyclooctadiene group. The new iridium carbene complex has a pair of hydrogen wing tips. The Ir−C_c_a_r_b_e_n_e bond lengths are 2.066(5) and 2.052(5) Å, and the bond angle C−Ir−C between these bonds is 95.54(19)°. The dihedral angle between two imidazol-2-ylidene rings is 86.42°.

[en] The new metal-rich phosphide Sm₁₅Ir₃₃P₂₆ was obtained from a reaction of the elements in a lead flux (1:2:2:30 molar ratio, 1370 K, slow cooling rate). Sm₁₅Ir₃₃P₂₆ adopts a new structure type which was characterized by powder and single crystal X-ray data: C2/m, a = 4720.6(8), b = 392.87(9), c = 1329.2(2) pm, β = 95.478(1) , wR2 = 0.0376, 3757 F² values and 227 variables. The iridium and phosphorus atoms build up a complex three-dimensional [Ir₃₃P₂₆]^δ- polyanionic network in which the samarium atoms fill diverse larger cavities with coordination numbers of 15-17. The seventeen crystallographically independent iridium atoms have between 3 or 4 phosphorus neighbors in distorted trigonal-, square-planar, or tetrahedral coordination. All phosphorus atoms are isolated and most of them fill tri-capped trigonal prisms. The Sm₁₅Ir₃₃P₂₆ structure is an intergrowth variant of ThCr₂Si₂, SrPtSb, CeMg₂Si₂, and TiNiSi-related slabs. (orig.)

[en] Developing efficient catalysts to accelerate the rate of oxygen evolution reaction (OER) is critical for photocatalytic water-splitting. In this work, metallic Ir, IrO_x(OH)_y, and core–shell Ir@IrO_x(OH)_y were synthesized and employed as OER catalysts for photocatalytic water oxidation. It was found that the Ir@IrO_x(OH)_y core–shell heterostructure catalyst showed the best photocatalytic performance among these three catalysts, with the oxygen evolution rate as high as 59.63 mmol g⁻¹ h⁻¹. Detailed investigations revealed that the excellent photocatalytic activity of Ir@IrO_x(OH)_y could be attributed to both the outstanding intrinsic activity of IrO_x(OH)_y shell and the efficient electron transfer between the photosensitizer and catalyst. (paper)