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IrIII Complexes (iriii + complex)

Distribution by Scientific Domains
Polymers and Materials Science50%
Chemistry50%

Selected Abstracts

Functional IrIII Complexes and Their Applications

ADVANCED MATERIALS, Issue 13 2010
Zhu-qi Chen
Abstract Iridium complexes are drawing great interest because they exhibit high phosphorescence quantum efficiency. Extensive efforts have been devoted to the molecular design of ligands to achieve phosphorescent emission over a wide range of wavelengths that is compatible with many applications. In this research news article, we focus on materials design to improve the performance of phosphorescent IrIII complexes for organic light-emitting diodes (OLEDs), luminescence sensitizers, and biological imaging. [source]

Iridium-Catalyzed Allylic Substitution: Stereochemical Aspects and Isolation of IrIII Complexes Related to the Catalytic Cycle.

CHEMINFORM, Issue 4 2003
Bjoern Bartels
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Cyclometalated IrIII Complexes with Substituted 1,10-Phenanthrolines: A New Class of Efficient Cationic Organometallic Second-Order NLO Chromophores

CHEMISTRY - A EUROPEAN JOURNAL, Issue 16 2010
Adriana Valore Dr.
Abstract Cyclometalated cationic IrIII complexes with substituted 1,10-phenanthrolines (1,10-phen), such as [Ir(ppy)2(5-R-1,10-phen)]Y (ppy=cyclometalated 2-phenylpyridine; R=NO2, H, Me, NMe2; Y,=PF6,, C12H25SO3,, I,) and [Ir(ppy)2(4-R,7-R-1,10-phen)]Y (R=Me, Ph) are characterized by a significant second-order optical non linearity (measured by the electrical field induced second harmonic generation (EFISH) technique). This nonlinearity is controlled by MLCT processes from the cyclometalated IrIII, acting as a donor push system, to ,* orbitals of the phenanthroline, acting as an acceptor pull system. Substitution of cyclometalated 2-phenylpyridine by the more , delocalized 2-phenylquinoline (pq) or benzo[h]quinoline (bzq) or by the sulfur-containing 4,5-diphenyl-2-methyl-thiazole (dpmf) does not significantly affect the ,, absolute value, which instead is affected by the nature of the R substituents on the phenanthroline, the higher value being associated with the electron-withdrawing NO2 group. By using a combined experimental (the EFISH technique and 1H and 19F PGSE NMR spectroscopy) and theoretical (DFT, time-dependent-DFT (TDDFT), sum over states (SOS) approach) investigation, evidence is obtained that ion pairing, which is controlled by the nature of the counterion and by the concentration, may significantly affect the ,, values of these cationic NLO chromophores. In CH2Cl2, concentration-dependent high absolute values of ,, are obtained for [Ir(ppy)2(5-NO2 -1,10-phen)]Y if Y is a weakly interacting anion, such as PF6,, whereas with a counterion, such as C12H25SO3, or I,, which form tight ion-pairs, the absolute value of ,, is lower and quite independent of the concentration. This ,, trend is partially due to the perturbation of the counterion on the LUMO ,* levels of the phenanthroline. The correlation between the ,, value and dilution shows that the effect of concentration is a factor that must be taken into careful consideration. [source]

Luminescence Switching of a Cyclometalated Iridium(III) Complex through a Redox-active Tetrathiafulvalene-based Ligand

CHEMISTRY - A EUROPEAN JOURNAL, Issue 35 2009
Chun-Hu Xu
OFF-ON-OFF: By reversible modulation of the oxidation states of the synthesised IrIII complex seen here, distinct electron-transfer efficiencies are exhibited and, remarkably, affect the properties of the IrIII core in the excited state. Thereby, a redox-controlled "OFF-ON-OFF" molecular phosphorescence switch is realized. [source]

Functional IrIII Complexes and Their Applications

ADVANCED MATERIALS, Issue 13 2010
Zhu-qi Chen
Abstract Iridium complexes are drawing great interest because they exhibit high phosphorescence quantum efficiency. Extensive efforts have been devoted to the molecular design of ligands to achieve phosphorescent emission over a wide range of wavelengths that is compatible with many applications. In this research news article, we focus on materials design to improve the performance of phosphorescent IrIII complexes for organic light-emitting diodes (OLEDs), luminescence sensitizers, and biological imaging. [source]

Promising Optoelectronic Materials: Polymers Containing Phosphorescent Iridium(III) Complexes

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 9-10 2010
Qiang Zhao
Abstract As one of the most promising optoelectronic materials, polymers that contain phosphorescent IrIII complexes have attracted more and more interest in recent years. They are a class of well-known electroluminescent materials with excellent performance. So far, efficient green-, red-, and white-emitting polymer light-emitting diodes based on polymers with on-chain IrIII complexes have been realized successfully. For the realization of this class of polymer material, IrIII complexes (as energy guest) can be introduced into the main-chain or side-chain of polymers (as energy host). In this article, we summarize the design principles, synthetic routes, structure,property relationships, and applications in optoelectronic devices of polymers that contain phosphorescent IrIII complexes. [source]

Cyclometalated IrIII Complexes with Substituted 1,10-Phenanthrolines: A New Class of Efficient Cationic Organometallic Second-Order NLO Chromophores

CHEMISTRY - A EUROPEAN JOURNAL, Issue 16 2010
Adriana Valore Dr.
Abstract Cyclometalated cationic IrIII complexes with substituted 1,10-phenanthrolines (1,10-phen), such as [Ir(ppy)2(5-R-1,10-phen)]Y (ppy=cyclometalated 2-phenylpyridine; R=NO2, H, Me, NMe2; Y,=PF6,, C12H25SO3,, I,) and [Ir(ppy)2(4-R,7-R-1,10-phen)]Y (R=Me, Ph) are characterized by a significant second-order optical non linearity (measured by the electrical field induced second harmonic generation (EFISH) technique). This nonlinearity is controlled by MLCT processes from the cyclometalated IrIII, acting as a donor push system, to ,* orbitals of the phenanthroline, acting as an acceptor pull system. Substitution of cyclometalated 2-phenylpyridine by the more , delocalized 2-phenylquinoline (pq) or benzo[h]quinoline (bzq) or by the sulfur-containing 4,5-diphenyl-2-methyl-thiazole (dpmf) does not significantly affect the ,, absolute value, which instead is affected by the nature of the R substituents on the phenanthroline, the higher value being associated with the electron-withdrawing NO2 group. By using a combined experimental (the EFISH technique and 1H and 19F PGSE NMR spectroscopy) and theoretical (DFT, time-dependent-DFT (TDDFT), sum over states (SOS) approach) investigation, evidence is obtained that ion pairing, which is controlled by the nature of the counterion and by the concentration, may significantly affect the ,, values of these cationic NLO chromophores. In CH2Cl2, concentration-dependent high absolute values of ,, are obtained for [Ir(ppy)2(5-NO2 -1,10-phen)]Y if Y is a weakly interacting anion, such as PF6,, whereas with a counterion, such as C12H25SO3, or I,, which form tight ion-pairs, the absolute value of ,, is lower and quite independent of the concentration. This ,, trend is partially due to the perturbation of the counterion on the LUMO ,* levels of the phenanthroline. The correlation between the ,, value and dilution shows that the effect of concentration is a factor that must be taken into careful consideration. [source]